Definition of nucleolus in English:

nucleolus

Syllabification: nu·cle·o·lus
Pronunciation: /n(y)o͞oˈklēələs
 
/

noun (plural nucleoli /-ˌlī, -ˌlē/)

Biology
  • A small dense spherical structure in the nucleus of a cell during interphase.
    More example sentences
    • Microscopically, large neoplastic lymphoid cells with prominent nucleoli and frequent mitotic figures occlude small vessel lumina.
    • As the cells separated their chromosomes, the nucleolus also appeared to segregate asymmetrically between mother and daughter cells, with the majority in the mother.
    • The tumor cells were arranged in trabecular and solid patterns with nuclear pleomorphism, prominent nucleoli, and scant basophilic cytoplasm.

Derivatives

nucleolar

adjective
More example sentences
  • In addition to nucleolar prominence, multiple nucleoli and nucleolar margination have also been suggested as diagnostic criteria for prostate cancer.
  • Active transcription of ribosomal DNA is required in all organisms for both nucleolar formation and ribosome biogenesis.
  • The LTR probe uniformly labels the chromosome arms except at the telomeres, nucleolar organizing regions, and centromeres, where the signal is lacking.

Origin

mid 19th century: from late Latin, diminutive of Latin nucleus 'inner part, kernel' (see nucleus).

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