What is the origin of evanesce?

Evanesce “to disappear gradually” comes from the Latin verb ēvānēscere “to disappear,” from the prefix ex- (also ē-) “out of, from” and the verb vānēscere “to fade away.” We already learned about the prefix ex- as part of the recent Word of the Day selection eradicate, while vānēscere derives from the adjective vānus “empty, vain” and the inchoative suffix -ēscere. Vānus is also the source of words such as vanity and vanish, and -ēscere roughly means “to become, start to be,” as we learned from recent Word of the Day selections deliquesce and iridescent, both of which are based on this suffix. Evanesce was first recorded in English circa 1820.