It is a circular basin, adorned with an arcade of trefoil arches.
The tympanum of the large arch is pierced with a quatrefoil or trefoil.
Everybody knew that she was a trefoil and her presence therefore raised no question.
For the figure cut in the rind was that of a shamrock—a trefoil with its stalk.
These trefoil leaves are made separately, and then sewn together.
Of cuckoo-flowers, “or Ladies smockes,” both the double and the trefoil.
The trefoil opening is made by boring three holes with a large bit at the points of a triangle.
It feeds on Bird's-foot trefoil and other leguminous plants.
Only don't let this trefoil of yours get to fighting with one another.
Lotus is the name of a native genus akin to the trefoil and clovers.