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Webster 1913 Edition

Trefoil

Tre′foil

,
Noun.
[L.
tres
three + E.
foil
leaf; cf. F.
frèfle
, It.
trifoglio
, L.
trifolium
. See
Tri-
,
Foil
leaf, and cf.
Trifoly
.]
1.
(Bot.)
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.)
An ornamental foliation consisting of three divisions, or foils.
3.
(Her.)
A charge representing the clover leaf.

Webster 1828 Edition

Trefoil

TRE'FOIL

,
Noun.
[L. 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.

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