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nu·cle·us
 nucleus
- pronunciation:
- nu
kli
 s
- features:
- Word Explorer
| part of speech: |
noun |
| inflections: |
nuclei, nucleuses |
| definition 1: |
the central, essential, or highly concentrated part around which other parts are grouped.
The harbor became the nucleus of a booming city.- synonyms:
- core, hub
- similar words:
- center, heart, kernel, marrow, navel, nub, pith, soul
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| definition 2: |
in biology, the part of a cell that controls growth and reproduction.
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| definition 3: |
the main or central part of something with potential for further growth and development; kernel.
- synonyms:
- kernel
- similar words:
- core, embryo, germ, seed
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| definition 4: |
the positively charged central part of an atom.
In fission, the nucleus splits into smaller parts, releasing a great deal of energy. |
| related words: |
gist, hub, keynote |
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