BACTERIUM /bækˈtɪəɹ.ɪəm/ ► audio Scrabble 15 Words With Friends 19 Definition noun (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission. — synonyms: bacteria See all 318 words you can make from BACTERIUM → 9-letter words Words starting with B Words ending with M ← Unscramble different letters