from
The Collaborative International Dictionary of English v.0.48
Nucleolus \Nu*cle"o*lus\, n.; pl. {Nucleoli}. [L., a little nut,
dim. of nucleus.]
1. A little nucleus.
[1913 Webster]
2. (Biol.) A small rounded body contained in the nucleus of a
cell or a protozoan.
[1913 Webster]
Note: It was termed by Agassiz the entoblast. In the
protozoa, where it may be situated on one side of the
nucleus, it is sometimes called the endoplastule, and
is supposed to be concerned in the male part of the
reproductive process. See {Nucleus}.
[1913 Webster]