trefoils is a form of:

Trefoil



noun
1.
(1. Any of various plants of the genera Trifolium, Lotus, and related genera of the pea family, having compound trifoliate leaves. 2. An ornament, a symbol, or an architectural form having the appearance of a trifoliate leaf) សភាពដូចស្លឹងជួង
adjective
1.
ដែលមានសណ្ឋានដូចស្លឹកជួង
ENGLISH MEANING
noun
1.
Any plant of the genus Trifolium, which includes the white clover, red clover, etc.; -- less properly, applied also to the nonesuch, or black medic.
2.
An ornamental foliation consisting of three divisions, or foils.
3.
A charge representing the clover leaf.