TRE'FOIL, noun [Latin trifolium; tres, three, and folium, leaf.] The common name for many plants of the genus Trifolium; also, in agriculture, a name of the medicago tupulina, a plant resembling clover, with yellow flowers, much cultivated for hay and fodder.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI