Source : Webster's Revised Unabridged Dictionary (1913)

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.

   {Three-leaved nightshade}. See {Trillium}.