The Collaborative International Dictionary
Citrination \Cit`ri*na"tion\, n. [See Citrine.]
The process by which anything becomes of the color of a
lemon; esp., in alchemy, the state of perfection in the
philosopher's stone indicated by its assuming a deep yellow
color.
--Thynne.
Wiktionary
n. (context obsolete English) The process of taking on a lemon-yellow colour, as the philosopher's stone was supposed to do in alchemy.
Usage examples of "citrination".
Alkali, salt, potassium carbonate, And our burnt matters, and coagulate, Clay mixed with horses' or men's hair, and oil Of tartar, alum, glass, yeast, wort, argoil, Realgar, and our matters absorbent, And with them, too, our matters resorbent, And how we practised silver citrination And our cementing and our fermentation, Our moulds and testers, aye, and many more.