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Webster 1913 Edition

Adj.

[NL.

trinervatus

; pref.

tri-

+ L.

nervus

nerve.]

(Bot.)

Having three ribs or nerves extending unbranched from the base to the apex; – said of a leaf.

Gray.

Adj.

[L. tres and nervus.] In botany, having three nerves or unbranched vessels meeting behind or beyond the base.

trinervate ‎(not comparable)

(botany, of a leaf) Having three ribs or nerves extending unbranched from the base to the apex.
(Can we find and add a quotation of Gray to this entry?)