nucleoleBiol.|ˈnjuːklɪəʊl| [ad. L. nucleolus: cf. F. nucléole, Pg.nucleolo.] = nucleolus. 1864Webster, Nucleole, the nucleus within a nucleus; nucleolus. Dana.1875tr.Schmidt's Desc. & Darwinism 44 The nucleus is termed the germinal vesicle, and the nucleole the germinal spot.