TREFOIL
trefoil
(noun) an architectural ornament in the form of three arcs arranged in a circle
clover, trefoil
(noun) a plant of the genus Trifolium
medic, medick, trefoil
(noun) any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves
Source: WordNet® 3.1
Etymology
Noun
trefoil (plural trefoils)
Any of several plants of the pea family, having compound, trifoliate leaves; especially one of the genus Trifolium.
A symbol having the shape of such leaves, especially when used as an architectural ornament.
(topology) Ellipsis of trefoil knot.
Coordinate terms
• quatrefoil
• cinquefoil
• hexafoil
• sexfoil
• octofoil
• multifoil
• polyfoil
Anagrams
• loftier
Source: Wiktionary
Tre"foil, n. Etym: [L. tres three + E. foil leaf; cf. F. frèfle, It.
trifoglio, L. trifolium. See Tri-, Foil leaf, and cf. Trifoly.]
1. (Bot.)
Definition: Any plant of the genus Trifolium, which includes the white
clover, red clover, etc.; -- less properly, applied also to the
nonesuch, or black medic. See Clover, and Medic.
2. (Arch.)
Definition: An ornamental foliation consisting of three divisions, or
foils.
3. (Her.)
Definition: A charge representing the clover leaf.
Source: Webster’s Unabridged Dictionary 1913 Edition