INTERSTITIAL /ɪntəˈstɪʃəl/ ► audio Scrabble 12 Words With Friends 14 Scrabble letter values: I1N1T1E1R1S1T1I1T1I1A1L1 = 12 Definition adjective of or relating to interstices. See all 733 words you can make from INTERSTITIAL → 12-letter words Words starting with I Words ending with L ← Unscramble different letters