noun
Biology term for the small dense structure within the nucleus of a cell, involved in ribosome synthesis.
核小体はリボソームRNAの合成に関与している。
The nucleolus is involved in the synthesis of ribosomal RNA.
細胞核 is the cell nucleus; 核小体 is a substructure within it.
From 核 (nucleus) + 小 (small) + 体 (body), a direct translation of the biological term 'nucleolus'.