a minute, slender catfish of the Amazon region, feeding by sucking blood from other fishes and sometimes entering the body orifices of mammals. It is notorious for its occasional habit of entering the urethra of human bathers.
Vandellia cirrhosa, family Trichomycteridae
mid 19th century: via Portuguese from Tupi candirú
candiru in other Oxford dictionaries
Definition of candiru in the US English dictionary