Crossword Genius

Four: Prefix (5)

Ross

I believe the answer is:

tetra

'four prefix' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tetra that I've seen before include "starter for four" , "Small bright fish" , "Bright tropical fish" , "Wrongful act (Law)" , "Denoting four (prefix)" .)

I've seen this clue in The New York Times.
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