herbicide herbicidal • herbicolous · · · Info · Definitions · Synonyms · Characters · · herbicide · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) a chemical agent that destroys plants or inhibits their growth. Synonyms: weedkiller, weed killer. · · Noun Definition 1 Synonyms · · · weedkiller · · Synonym 1 weed killer · · Synonym 2 Characters · · b latin small letter b U+0062 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 r latin small letter r U+0072