Vitellines

Part of speech: noun

Definitions

1. A reference to structures or membranes related to yolk material in eggs, particularly in embryonic development
2. Pertaining to the cellular layers that encompass the yolk, serving vital functions during early growth stages
3. Describing elements involved in the nourishment and protection of an embryo, particularly in species that lay eggs

Etymology: "Vitellines" is the plural of "vitelline," which came into English as a learned borrowing from the Latin "vitellīnus," meaning "of a calf" or "of veal," itself derived from "vitellus," a diminutive of "vitulus," calf. The Latin adjective was applied to the yolk because of its yellow colour, which a Latin speaker might liken to the hue of a calf's flesh or hide. Biologists later borrowed the term to describe the yolk-related membranes and layers of eggs, so the word that once referred to young cattle now names the tissues surrounding the yolk in developing embryos.