Quadri- minus one (3)

I believe the answer is:

tri

(Other definitions for tri that I've seen before include "Denotes three" , "Prefix meaning three" , "Prefix denoting three" , "Three-point" , "Prefix indicating three" .)

I've seen this clue in the USA Today, The New York Times and the Newsday.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.