tet•raPronunciation: (te'tru), [key]
any of several tropical, freshwater fishes of the family Characidae, often kept in aquariums.
a combining form meaning “four,” used in the formation of compound words: tetrabranchiate. Also, esp. before a vowel,tetr-.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.