vitellus

  1. (archaic, countable, uncountable) The contents or substance of the ovum; egg yolk.
  2. (countable, uncountable) Perisperm in an early condition.
  3. (countable, uncountable) An oily substance adhering to the spores of Lycopodium.

Etymology

From Latin vitellus (“the yolk of an egg”). Doublet of veal.

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