biological agent biological • biological attack · · · Info · Definitions · Synonyms · Characters · · biological agent · · Text Common · · Latin · · Scripts 16 · · Length 6 · · Syllables Definitions · · · (noun) any bacterium or virus or toxin that could be used in biological warfare. Synonyms: biological agent, biohazard. · · Noun Definition 1 Synonyms · · · biohazard · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074