nucleus

Từ điển Oxford Advanced Learner 8th

nu·cleus [nucleus nuclei] BrE [ˈnjuːkliəs] NAmE [ˈnuːkliəs] noun (pl. nu·cleiBrE [ˈnjuːkliaɪ] ; NAmE [ˈnuːkliaɪ] )
1. (physics)the part of an atom that contains most of its mass and that carries a positive electric charge
see also ↑neutron, ↑proton
2. (biology)the central part of some cells, containing the ↑genetic material
3. the central part of sth around which other parts are located or collected
•These paintings will form the nucleus of a new collection.

Word Origin:
early 18th cent.: from Latin, literally kernel, inner part, diminutive of nux, nuc- ‘nut’.

• Từ đồng nghĩa / Synonyms:
  lens nucleus, core, core group, cell nucleus, karyon