i Register
In some senses, vitellus is marked as archaic. Watch for register when choosing this word.
noun
The contents or substance of the ovum; egg yolk.
In the sarcodo there takes place a process which may be in some measure compared with what occurs in the vitellus after the fecundation of an ovum. The granules becoming united together form groups, which soon divide and subdivide […]
Perisperm in an early condition.
An oily substance adhering to the spores of Lycopodium.