"composed of or produced by malt," 1817, from malt (n.) + -y (2). Also, in old slang, "drunk with beer, or drunkish any how, stupidly so" [John Bee, "Slang," 1823].
malthouse
Malthusian
maltreat
maltreatment
maltster
malty
malvaceous
malversation
Malvinas
malware
mama