from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Biology A small, typically round granular body composed of protein and RNA in the nucleus of a cell. It is usually associated with a specific chromosomal site and involved in ribosomal RNA synthesis and the formation of ribosomes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A conspicuous, rounded body within the nucleus of a cell.
from the GNU version of the Collaborative International Dictionary of English
- n. A little nucleus.
- n. A small rounded body contained in the nucleus of a cell or a protozoan.
from The Century Dictionary and Cyclopedia
- In zoology, the nucleus of a nucleus; one of the rounded deeply staining structures found in the nucleus of a cell.
- Specifically, in Infusoria, a minute particle attached to the exterior of the nucleus (or “ovary”), supposed to function as a testicle.
- In botany, a small solid rounded granule or particle in the interior of the nucleus. There may be several nucleoli in each nucleus.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis
New Latin, from Latin, diminutive of nucleus, kernel; see nucleus.(American Heritage® Dictionary of the English Language, Fourth Edition)