lethal agent lethal • lethal dose · · · Info · Definitions · Characters · · lethal agent · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) an agent capable of causing death. Synonyms: lethal agent. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 l latin small letter l U+006C n latin small letter n U+006E t latin small letter t U+0074