nucleus
gb/nˈukliəs/ us/nˈukliəs/
B2
Engleză
~ 6500
Sensuri
0 sensuri
Substantiv
B2
entity
1
central or most important part
The main part or small main group in the center of something that everything else grows around or depends on.
Tipar de utilizare:
the nucleus of [something]
Greșeală frecventă:
Learners sometimes confuse "nucleus" with more common words like "core" or "center". In general English, "core" and "center" are more frequent, and "nucleus" can sound more formal or technical. Another common issue is the plural form: the usual plural is "nuclei" /ˈnuːkliˌaɪ/ or /ˈnjuːkliˌaɪ/, not *"nucleuses" in most written English, although "nucleuses" is sometimes accepted in general contexts.
Sinonime
core (The most common everyday word for the central or most important part of something; slightly broader and less formal than "nucleus".)
|
hub (Suggests a busy, active center of activity, while "nucleus" can be quieter or more abstract.)
Antonime
periphery (Refers to the outer edge or less important parts, in contrast to "nucleus" as the central, important part.)
|
fringe (Describes people or things at the edge of a group or activity, opposite of the central "nucleus".)
Colocații
the nucleus of the group
|form the nucleus of
|nucleus of a movement
|nucleus of an idea
|nucleus of a team
|small nucleus of supporters
Teme
general
|society
|abstract_ideas
|core_vocabulary
|education
Exemple
- A small group of volunteers formed the nucleus of the new charity.
- The city’s tech district is the nucleus of its innovation economy.
- At that time, there was only a tiny nucleus of dedicated fans, but the band soon became famous.
- These early chapters contain the nucleus of the ideas that shaped his later work.
- Family and close friends are often the nucleus of a person’s support network.
Exemple pentru cursanți
- A few students formed the nucleus of the English club.
- Trust is the nucleus of a good relationship.
- This small town became the nucleus of the country’s oil industry.
- Her first book was the nucleus of her long writing career.
Substantiv
technical
C1
entity
2
central part of a cell
The main round part inside a cell that holds the cell’s DNA and controls what the cell does.
Tipar de utilizare:
the nucleus of [a cell]
Greșeală frecventă:
Learners often confuse the cell "nucleus" with the "nucleus" of an atom because they share the same word and both are in the center. In biology, the nucleus is a structure inside a cell, not inside an atom. Another common mistake is using only the adjective "nuclear" (as in "nuclear DNA") and forgetting that the noun for the cell structure is "nucleus".
Sinonime
cell core (A descriptive phrase sometimes used informally in explanations; it is not a standard technical term like "nucleus".)
Antonime
cytoplasm (Refers to the material of the cell outside the nucleus, contrasting with the central nucleus.)
Colocații
cell nucleus
|the nucleus of a cell
|within the nucleus
|inside the nucleus
|nuclear membrane surrounding the nucleus
|nucleus and cytoplasm
Teme
science
|biology
|medicine
|health
|education
Exemple
- In eukaryotic cells, the DNA is stored inside the nucleus.
- The nucleus is surrounded by a double membrane that separates it from the cytoplasm.
- Mutations in the proteins that move into and out of the nucleus can cause serious diseases.
- Under the microscope, the stained nucleus appears darker than the rest of the cell.
- The nucleus plays a key role in controlling cell growth and division.
Exemple pentru cursanți
- The nucleus is in the center of the cell.
- DNA is kept safe inside the nucleus.
- The nucleus tells the cell what to do.
- In many pictures of cells, the nucleus is shown as a dark circle.
unknown
technical
C1
entity
3
central part of an atom
The tiny, heavy center of an atom that is made of protons and neutrons and has a positive charge.
Tipar de utilizare:
the nucleus of [an atom]
Greșeală frecventă:
Learners sometimes mix up the atomic nucleus with the cell nucleus because both are called "nucleus" and are central. In physics and chemistry, "nucleus" always refers to the center of the atom, not to a part of a cell. Another issue is confusing the pronunciation of "nucleus" /ˈnuːkliəs/ with the adjective "nuclear" /ˈnuːkliər/.
Sinonime
atomic core (A descriptive phrase used in explanations; less precise and far less common than the technical term "nucleus".)
Antonime
electron cloud (Refers to the region around the nucleus where electrons are found, contrasting with the central nucleus itself.)
Colocații
atomic nucleus
|the nucleus of an atom
|split the nucleus
|nucleus and electrons
|nuclear charge of the nucleus
|unstable nucleus
Teme
science
|physics
|education
|core_vocabulary
Exemple
- Electrons move around the atomic nucleus in specific energy levels.
- The number of protons in the nucleus determines which element an atom belongs to.
- In nuclear fission, the nucleus of an atom splits into smaller parts and releases energy.
- Most of the mass of an atom is concentrated in its nucleus.
- The nucleus is held together by the strong nuclear force.
Exemple pentru cursanți
- The nucleus is at the center of the atom.
- Protons and neutrons are in the nucleus.
- Almost all the mass of the atom is in the nucleus.
- Electrons move around the nucleus.
Substantiv
technical
C2
entity
4
solid core of a comet
The hard center of a comet, mostly ice and dust, that makes the bright cloud and tail when it gets close to the sun.
Tipar de utilizare:
the nucleus of [a comet]
Greșeală frecventă:
Learners may assume "nucleus" in space contexts refers to an atom or a cell. In astronomy, it usually refers specifically to the solid central part of a comet, not to atomic structure or biology.
Sinonime
core (A general word for the central part of something; less precise than the technical term "nucleus" in astronomy.)
Antonime
comet tail (Refers to the extended, outer part of a comet, contrasting with the small central nucleus.)
Colocații
comet nucleus
|the nucleus of the comet
|icy nucleus
|active nucleus
|dark nucleus
|nucleus and coma
Teme
science
|space
|astronomy
|education
Exemple
- As the comet nears the sun, gas and dust stream away from its nucleus to form a bright tail.
- Spacecraft images revealed that the comet’s nucleus is smaller and darker than scientists expected.
- The icy nucleus slowly evaporates when heated, feeding the surrounding coma.
- Impacts on the nucleus can change the comet’s rotation and shape.
Exemple pentru cursanți
- The nucleus of the comet is made of ice and dust.
- When the comet gets hot, gas comes off the nucleus.
- Scientists sent a probe to study the nucleus of a comet.
Substantiv
technical
C2
entity
5
central part of a molecule
In chemistry, the main central part of a molecule, often a ring of atoms, that other parts are joined to.
Tipar de utilizare:
the nucleus of [a molecule/structure]
Greșeală frecventă:
This sense is quite technical, and learners may confuse it with the atomic nucleus. In chemistry, here "nucleus" refers to the central arrangement of atoms in a molecule, not the center of a single atom.
Sinonime
ring (Refers specifically to cyclic structures; overlaps with some uses of "nucleus" but is more concrete and structural.)
Antonime
substituent (A group attached to a central structure; it contrasts with the central "nucleus" of the molecule.)
Colocații
benzene nucleus
|aromatic nucleus
|nucleus of the molecule
|steroid nucleus
|ring nucleus
Teme
science
|chemistry
|education
Exemple
- The benzene nucleus is a common structural feature in many organic compounds.
- In this drug molecule, several side chains are attached to a steroid nucleus.
- Substitutions on the aromatic nucleus can greatly change a compound’s reactivity.
Exemple pentru cursanți
- Many molecules have a main nucleus with small groups on it.
- The benzene nucleus is a ring of six carbon atoms.
- Chemists look at the nucleus of the molecule and the groups attached to it.
Gramatică
Forma de dicționar
nucleus
IPA
GB/nˈukliəs/
US/nˈukliəs/
Silabe și accent
nuc - le - us (3 silabe)
Stress on 1st syllable (nuc)
Forme ale cuvântului
Noun
- Base: nucleus
- Plural: nuclei, nucleuses
Familie de cuvinte
Forms
nuclei
noun
nucleuses
noun
Core family
nuclear
adjective B1
Negative and opposite forms
non-nuclear
adjective
antinuclear
adjective
Advanced or less common
nucleic
adjective
nucleate
verb
nucleation
noun
Expresii
cell nucleus
1/sˈɛl nˈukliəs/
fixed phrase
technical
central DNA-containing part of a cell
the part in the center of a cell that holds the cell’s DNA
Exemple
- The cell nucleus is clearly visible under the microscope.
- Damage to the cell nucleus can stop the cell from dividing correctly.
form the nucleus of
1/fˈɔɹm ðə nˈukliəs əv/
fixed phrase
be the central core of something
to be the small main group or part at the center of something, especially at the beginning, that the rest grows around
Exemple
- These early supporters will form the nucleus of the new organization.
- A handful of experienced players formed the nucleus of the national team.
- The pilot project formed the nucleus of a much larger education program.
atomic nucleus
1/ətˈɑmɪk nˈukliəs/
fixed phrase
technical
central core of an atom
The tiny center of an atom that holds protons and neutrons.
Exemple
- Most of an atom’s mass is in the atomic nucleus.
- The atomic nucleus carries a positive charge because of the protons.
- Electrons move around the atomic nucleus in different energy levels.
- Nuclear power plants use energy released from changes in the atomic nucleus.
- The discovery of the atomic nucleus changed ideas about matter.