TRIOS Scrabble 5 Words With Friends 5 Definition TRIOS is the plural of TRIO. noun TRIO: the cardinal number that is the sum of one and one and one. Anagrams of TRIOS riotsrotistirostorsitrois See all 35 words you can make from TRIOS → 5-letter words Words starting with T Words ending with S ← Unscramble different letters