| Word | Definitions | Synonyms |
|---|---|---|
| trefoil | (noun) an architectural ornament in the form of three arcs arranged in a circle | - |
| (noun) a plant of the genus Trifolium | Synonyms: clover | |
| (noun) any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves | Synonyms: medic, medick |