Dictionary.com
definitions

canaigre

[kuh-nahy-gree]
noun
  1. a plant, Rumex hymenosepalus, of the buckwheat family, found from Oklahoma to California, having clustered, tuberous roots that yield tannin.

Origin of canaigre

1875–80, Americanism; < Mexican Spanish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for canaigre

canaigre

noun
  1. a dock, Rumex hymenosepalus, of the southern US, the root of which yields a substance used in tanning

Word Origin for canaigre

C19: from Mexican Spanish
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