bonanza

[ buh-nan-zuh, boh- ]
/ bəˈnæn zə, boʊ- /

noun

a rich mass of ore, as found in mining.
a source of great and sudden wealth or luck; a spectacular windfall: The play proved to be a bonanza for its lucky backers.

Origin of bonanza

1835–45, Americanism; < Spanish: literally, smooth sea (hence, good luck, rich vein of ore), nasalized variant of Medieval Latin bonacia, equivalent to Latin bon(us) good + (mal)acia calm sea < Greek malakía softness (malak(ós) soft + -ia -ia)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for bonanza

British Dictionary definitions for bonanza

bonanza

/ (bəˈnænzə) /

noun

a source, usually sudden and unexpected, of luck or wealth
US and Canadian a mine or vein rich in ore

Word Origin for bonanza

C19: from Spanish, literally: calm sea, hence, good luck, from Medieval Latin bonacia, from Latin bonus good + malacia dead calm, from Greek malakia softness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012