ISTHMIAN Scrabble 13 Words With Friends 14 Scrabble letter values: I1S1T1H4M3I1A1N1 = 13 Definition adjective of or relating to or forming an isthmus. Anagrams of ISTHMIAN histaminthiamins See all 150 words you can make from ISTHMIAN → 8-letter words Words starting with I Words ending with N ← Unscramble different letters