This is an irregular feature - both in frequency and oddness - dedicated to a word I came across that I have never previously used.
margaritaceous mar-guhr-ih-TAY-shuhs adj. Related to, or resembling pearls; pearl-like; having the satiny, opaque iridescence like that of pearls.
The word is derived from the Latin margarita and from the Greek margarites , both of which translate directly as "pearl." The alcoholic beverage called the margarita was likely named after a woman; Wikipedia has several possible origins of the drink name.