TERTIARY Scrabble 11 Words With Friends 10 Definition adjective coming next after the second and just before the fourth in position. — synonyms: third, 3rd noun from 63 million to 2 million years ago. — synonyms: Tertiary_period See all 111 words you can make from TERTIARY → 8-letter words Words starting with T Words ending with Y ← Unscramble different letters