Noun
(US) Rumex hymenosepalus, a species of dock native to southwestern North America with edible red stems and taproots containing tannin. [from mid 19th c.]
Synonyms: tanner's dock, wild rhubarb
(US) Tannin-containing matter obtained from the taproots of the plant.
cañaigre (uncountable)
Alternative form of canaigre