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1. Dictionary

   nucleus

   /ˈnjuːklɪəs/

   noun

   • 1. the central and most important part of an object, movement, or group, forming the basis for its activity and growth: "the nucleus of a British film-producing industry" Similar corecentrecentral partmost important partheartnubhubmiddlemidpointeyekernelfocusfocal pointpivotcruxliterary:navelrare:omphalos
   • 2. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
   • ▪ a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
   • ▪ a discrete mass of grey matter in the central nervous system.
   • ▪ the solid part of a comet's head.

   Word Origin mid 17th century (denoting the solid part of a comet's head): from Latin, literally ‘kernel, inner part’, diminutive of nux, nuc- ‘nut’.

   Scrabble Points: 9

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2. www.britannica.com › science › nucleus-biologyNucleus | Definition, Function, Structure, & Facts | Britannica

   www.britannica.com › science › nucleus-biology

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   May 27, 2024 · nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane.

3. byjus.com › biology › the-nucleusWhat is a Nucleus?- Structure and Function of Nucleus - BYJU'S

   byjus.com › biology › the-nucleus

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   A nucleus is defined as a double-membraned eukaryotic cell organelle that contains the genetic material. A nucleus diagram highlighting the various components. Moreover, only eukaryotes have the nucleus, prokaryotes have the nucleoid.

4. www.merriam-webster.com › dictionary › nucleusNucleus Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › nucleus

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   The meaning of NUCLEUS is the small bright body in the head of a comet. How to use nucleus in a sentence.

5. dictionary.cambridge.org › dictionary › englishNUCLEUS | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   NUCLEUS definition: 1. the central part of an atom, usually made up of protons and neutrons 2. the part of a cell that…. Learn more.

6. www.sciencefacts.net › cell-nucleusCell Nucleus: Definition, Structure, & Function, with Diagram

   www.sciencefacts.net › cell-nucleus

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   Feb 4, 2021 · Nucleus is a membrane-bound organelle that houses DNA, the genetic material of a eukaryotic cell whereas nucleolus is a sub-organelle found within the nucleus containing RNA and is responsible for ribosome synthesis.

7. www.biologyonline.com › dictionary › nucleusNucleus - Definition and Examples - Biology Online Dictionary

   www.biologyonline.com › dictionary › nucleus

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   Sep 1, 2023 · A nucleus is a large double-membraned organelle that is sometimes referred to as the “central unit ” of the cell because it contains the chromosomes that bear the genetic material. It is not found only in eukaryotic cells and not in prokaryotic cells.

8. www.dictionary.com › browse › nucleusNUCLEUS Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › nucleus

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   Nucleus definition: a central part about which other parts are grouped or gathered; core. See examples of NUCLEUS used in a sentence.