Glossary of Medical Terms

Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine

OVUM

1. The female reproductive cell which, after fertilization, develops into a new member of the same species (von Baer, 1827), an egg. 2. The human ovum: a round cell about 0.1 mm. In diameter, produced in the ovary, where there is deposited near it a noncellular covering (oolemma, zona pellucida, zona radiata). It consists of protoplasm which contains some yolk, enclosed by a thin cell wall (vitelline membrane). There is a big nucleus (germinal vesicle), within which is a nucleolus (germinal spot). By extension, the word is also used to identify any early stage of the conceptus, when the embryo itself constitutes a tiny and insignificant part of the whole. This entry appears with alow from the Vocabulary of Cell and Molecular Biology
osteler   ostembryon   ostemia   os temporale   ostempyesis   ostend   ostensibility   ostensible   (1)
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