Webster's 1828 Dictionary
THREE-SIDED
a.[three and side. ] Having three plane sides; as a three-sided stem, leaf, petiole, peduncle, scape, or pericarp.
Webster's 1913 Dictionary
THREE-SIDED
THREE-SIDED Three "-sid `ed, a.
Defn: Having three sides, especially three plane sides; as, a three- sided stem, leaf, petiole, peduncle, scape, or pericarp.
The Wordsmith Dictionary