Crossword Genius

Sort of poem not usually pluralized by adding an -s (5)

Ross

I believe the answer is:

haiku

(Other definitions for haiku that I've seen before include "Japanese three-line verse form" , "17-syllable Japanese verse form" , "Jap 17 syllable poem" , "Japanese verse form of three short lines" , "Type of Japanese poem" .)

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