Wiktionary
triclopyr
n. A systemic foliar pyridine herbicide, used to control broadleaf weeds while leaving grasses and conifers unaffected.
Wikipedia
Triclopyr
Triclopyr (3,5,6-Trichloro-2-pyridinyloxyacetic acid) is an organic compound in the pyridine group that is used as a systemic, foliar herbicide and fungicide.