Definitions of Nucleus [ˌaɪ]

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Definition of 'Nucleus'

Random House Webster's College Dictionary

1. (n.) nucleus
a central part about which other parts are grouped or gathered; core.

2.  nucleus
a specialized, usu. spherical mass of protoplasm encased in a double membrane and found in eukaryotic cells, directing their growth, metabolism, and reproduction, and containing most of the genetic material.

3.  nucleus
the positively charged mass within an atom, composed of neutrons and protons and possessing most of the mass but occupying only a small fraction of the volume of the atom.

4.  nucleus
a mass of nerve cells in the brain or spinal cord in which nerve fibers form connections.

5.  nucleus
a fundamental arrangement of atoms, as the benzene ring, that may occur in many compounds by substitution of atoms without a change in structure.

6.  nucleus
the condensed portion of the head of a comet.

7.  nucleus
the central, most prominent segment in a syllable, consisting of a vowel or vowellike consonant, as the a-sound in cat or the l-sound in
bottle.

8.  nucleus
the most prominent syllable in an utterance or stress group; tonic syllable.

Etymology: (1695–1705; < L

Definition of 'Nucleus'

Princeton's WordNet

1. (noun) nucleus, cell nucleus, karyon
a part of the cell containing DNA and RNA and responsible for growth and reproduction

2. (noun) nucleus
the positively charged dense center of an atom

3. (noun) core, nucleus, core group
a small group of indispensable persons or things
"five periodicals make up the core of their publishing program"

4. (noun) nucleus
(astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail

5. (noun) nucleus
any histologically identifiable mass of neural cell bodies in the brain or spinal cord

6. (noun) lens nucleus, nucleus
the central structure of the lens that is surrounded by the cortex

Definition of 'Nucleus'

Webster Dictionary

1. (noun) Nucleus
a kernel; hence, a central mass or point about which matter is gathered, or to which accretion is made; the central or material portion; -- used both literally and figuratively

2. (noun) Nucleus
the body or the head of a comet

3. (noun) Nucleus
an incipient ovule of soft cellular tissue

4. (noun) Nucleus
a whole seed, as contained within the seed coats

5. (noun) Nucleus
a body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. It is more or less protoplasmic, and consists of a clear fluid (achromatin) through which extends a network of fibers (chromatin) in which may be suspended a second rounded body, the nucleolus (see Nucleoplasm). See Cell division, under Division

6. (noun) Nucleus
the tip, or earliest part, of a univalve or bivalve shell

7. (noun) Nucleus
the central part around which additional growths are added, as of an operculum

8. (noun) Nucleus
a visceral mass, containing the stomach and other organs, in Tunicata and some mollusks

Translation of 'Nucleus'

Kernerman English Multilingual Dictionary

Sense: the central part of an atom.
Afrikaans: kern	Arabic: نُواة الذَّرَّه	Bulgarian: ядро
Brazilian: núcleo	Czech: jádro	German: der Kern
Danish: kerne; nukleus	Greek: πυρήνας ατόμου	Spanish: núcleo
Estonian: (aatomi)tuum	Farsi: هسته مرکزى	Finnish: ydin
French: noyau	Hebrew: גַרעִין	Hindi: गूदा
Croatian: jezgra	Hungarian: (atom)mag	Indonesian: inti atom
Icelandic: kjarni	Italian: nucleo	Japanese: 原子核
Korean: 핵	Lithuanian: branduolys	Latvian: kodols
Malay: nukleus	Dutch: nucleus	Norwegian: (atom)kjerne
Polish: jądro	Persian: هسته مرکزى	Pashto: هسته يى
Portuguese: núcleo	Romanian: nucleu	Russian: ядро
Slovak: jadro	Slovenian: jedro	Serbian: jezgro
Swedish: kärna	Thai: ส่วนที่อยู่ตรงกลางของอะตอ	Turkish: atomçekirdeği, nükleon
Taiwanese: 原子核	Ukrainian: ядро	Urdu: ايٹم کا مرکزي حصہ
Vietnamese: tâm	Chinese: 原子核
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