Monday word: vitelline

[ersatz_read]

vitelline (v
-t
l

n, -
n
, v
-), adj.
1.  Resembling the yolk of an egg (for example, yellow in color)
2.  Of, relating to, or associated with the yolk of an egg.

Etymology:  from Latin vitellus (yolk), which apparently is a diminutive form of vitulus (calf, veal).

Vitellary has the same meaning, but references to that word mark it as a purely biological term.