ACTINOMETER Scrabble 15 Words With Friends 18 Scrabble letter values: A1C3T1I1N1O1M3E1T1E1R1 = 15 Definition noun an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect). See all 748 words you can make from ACTINOMETER → 11-letter words Words starting with A Words ending with R ← Unscramble different letters