THERMIONIC Scrabble 17 Words With Friends 19 Scrabble letter values: T1H4E1R1M3I1O1N1I1C3 = 17 Definition adjective of or relating to or characteristic of thermions. Examples “thermionic cathode” See all 374 words you can make from THERMIONIC → 10-letter words Words starting with T Words ending with C ← Unscramble different letters