lactobacilli lacto • Lactobacillus · · · Info · Definitions · Characters · · lactobacilli · · Text Latin · · Script 12 · · Length Definitions · · · (noun) a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk). Synonyms: lactobacillus. · · Noun Definition 1 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F t latin small letter t U+0074