You searched for: “tri-
tri-, try
tri- (TRIGH) (adjective)
A prefix used to indicate three of something: "He wore a tricorn hat to the parade."
try (TRIGH) (verb)
1. To attempt to do something, to experiment with something: "He will try a dish of pistachio ice cream this afternoon."
2. To undertake a judicial procedure to determine the guilt or innocence of an individual: "The judge agreed to try the traffic offender without a jury."

It's a good idea to try to use the prefix tri- to form many words that mean "three" plus whatever word element it is attached to; such as, "tripod, triple, triangle", and many others which can be seen by going to this tri-, tre- unit shown on this Word Info site.

A unit related to: “tri-
(Greek > Latin: a numerical prefix meaning, three, thrice, threefold; triple; a word element for number 3)