Meaning

noun a white linen liturgical vestment with sleeves; worn by priests

originFrom Middle English aube, awbe, albe, abbe, from Late Old English albe (but later reinforced by Old French aube, Medieval Latin alba), borrowed from Latin alba (as in tunica alba (“white tunic”), vestis alba (“white garment”)), feminine of albus (“white”). Doublet of alba.

Etymology from Wiktionary, CC BY-SA 3.0