mid-15c., pomis, "pulp of apples or similar fruits crushed by grinding, cider," from Medieval Latin pomacium or Old French pomaz, plural of pome "cider; apple," from Latin pomum "fruit; apple" (see Pomona).
Entries linking to pomace
Pomona n.
Roman goddess of fruit trees and their culture, from Latin pomum "apple; fruit," a word of uncertain origin. "Possibly from *po-emo- 'taken off, picked'; *po-omo- or *pe-omo- are also conceivable" [de Vaan]. Or perhaps borrowed from a lost Mediterranean language. Related: Pomonical.