'Three-leafed' definitions:

Definition of 'Three-leafed'

From: GCIDE

Three-leafed \Three"-leafed`\, Three-leaved \Three"-leaved`\, a. (Bot.) (a) Producing three leaves; as, three-leaved nightshade. (b) Consisting of three distinct leaflets; having the leaflets arranged in threes. [1913 Webster]
Three-leaved nightshade. See Trillium. [1913 Webster]