Learn how to say Nucleus correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word nucleus:
noun (plural nuclei /-lɪʌɪ/)
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
Physics the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
Biology a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
Anatomy a discrete mass of grey matter in the central nervous system.
Astronomy the solid part of a comet’s head.
early 18th century: from Latin, literally ‘kernel, inner part’, diminutive of nux, nuc- ‘nut’