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Webster 1913 Edition

Adj.

Having three lobes.

Three-lobed leaf

(Bot.)

a leaf divided into three parts, the sinuses extending not more than half way to the middle, and either the parts of the sinuses being rounded.

Adj.

[three and lobe.] A three-lobed leaf, is one that is divided to the middle into three parts, standing wide from each other and having convex margins.