The Collaborative International Dictionary
Water cavy
Cavy \Ca"vy\, n.; pl. Cavies. [NL. cavia, fr. Brazilian cabiai: cf. F. cabiai.] (Zo["o]l.) A rodent of the genera Cavia and Dolichotis, as the guinea pig ( Cavia cobaya). Cavies are natives of South America.
Water cavy (Zo["o]l.), The capybara.
Water cavy
Water cavy \Wa"ter ca"vy\ (Zo["o]l.) The capybara.
Wiktionary
water cavy
n. (context zoology English) The capybara.