from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A group of glands that secrete yolk around the egg in those invertebrates, such as worms, whose eggs do not contain yolk.
from The Century Dictionary and Cyclopedia
- n. A special gland of the female generative apparatus of some worms, additional to the germarium, in which gland an accessory vitelline substance is formed. See germarium, and cuts under Trematoda and Rhabdocœla.
New Latin, from Latin vitellus, egg yolk; see vitellus.(American Heritage® Dictionary of the English Language, Fourth Edition)