n(y)üˈklēələs noun
( plural nucleo·li -ēəˌlī)
Etymology: New Latin, from Latin, small kernel, diminutive of nucleus kernel — more at nucleus
1. : an organized body of predominantly protein structure that is typical of the metabolic nucleus, is variously regarded as a center of synthetic activity or as a storage organelle, and is usually absent during mitosis being formed anew after each division in contact with the nucleolus organizer of the SAT-chromosome : plasmosome — see cell illustration
2. : any differentiated nuclear body other than a chromosome (as an endosome, karyosome, or nucleocentrosome)