tri Get Printable Handwriting (tri) 1 syllables Hear It! Say It! Write It! Learn It! Spelling Test Definition prefix. meaning three or having three parts. Example Sentence The tri in triangle changes the meaning of angle to three angles. More Example Sentences He has a tri-colored dog. Synonyms threefold; trinity; triad Antonyms four Hear It! Say It! Write It! tri Switch to cursive Start Share with your friends: