citrination
noun
cit·ri·na·tion
ˌsi‧trə̇ˈnāshən
plural -s
obsolete
: an alchemical operation in which a base metal was made more yellow and therefore thought to have been brought nearer to gold
Word History
Etymology
Middle English citrinacioun, from Medieval Latin citrination-, citrinatio, from citrinus + Latin -ation-, -atio -ation
First Known Use
15th century, in the meaning defined above