Meaning

noun an especially rich vein of precious ore

noun a sudden happening that brings good fortune (as a sudden opportunity to make money)

originEtymology tree Proto-Indo-European *melh₂-der. Ancient Greek μᾰλᾰκός (mălăkós) Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-i-eh₂ Proto-Hellenic *-íā Ancient Greek -ῐ́ᾱ (-ĭ́ā) Ancient Greek μᾰλᾰκῐ́ᾱ (mălăkĭ́ā)bor. Latin malacia ▲ Latin bonusinflu. Vulgar Latin *bonacia Spanish bonanzabor. English bonanza Borrowed from Spanish bonanza (“dead calm, fair weather, good…

Etymology from Wiktionary, CC BY-SA 3.0