核かく仁じんMeanings1nounnucleolusbiology›Biology term for the small dense structure inside the nucleus of a cell. Often used in technical contexts; the cross-referenced term 核小体 is a synonym.See also: 核小体核かく仁じんはリボソームRNAの合ごう成せいに関かん与よしている。The nucleolus is involved in the synthesis of ribosomal RNA.