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The Collaborative International Dictionary
Trinodal

Trinodal \Tri*nod"al\, a. [L. trinodis three-knotted; tri- (see Tri-) + nodus knot.]

  1. (Bot.) Having three knots or nodes; having three points from which a leaf may shoot; as, a trinodal stem.

  2. (Geom.) Having three nodal points.

Wiktionary
trinodal

a. (context botany English) Having three nodes.