PENICILLIN /ˌpɛnɪˈsɪlɪn/ Scrabble 14 Words With Friends 20 Definition noun any of various antibiotics obtained from Penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases. See all 56 words you can make from PENICILLIN → 10-letter words Words starting with P Words ending with N ← Unscramble different letters