Meaning

noun any of several trees of the genus Morus having edible fruit that resembles the blackberry

noun sweet usually dark purple blackberry-like fruit of any of several mulberry trees of the genus Morus

originFrom Middle English mulbery, molberye, murberie, partly from Old English mōrberġe (“mulberry”) (q.v.), and probably partly from Middle Low German mulbere (“mulberry”), ultimately from Proto-West Germanic *mūrubaʀi ~ *mōrubaʀi, from Latin mōrus + Proto-West Germanic *baʀi. Compare Dutch moerbezie, moerbei (“mulberry”), German Maulbeere (“mulberry”).

Etymology from Wiktionary, CC BY-SA 3.0