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1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Vex·il·lar Vex·il·la·ry
 1. Of or pertaining to an ensign or standard.
 2. Bot. Of or pertaining to the vexillum, or upper petal of papilionaceous flowers.
 Vexilary aestivation Bot., a mode of aestivation in which one large upper petal folds over, and covers, the other smaller petals, as in most papilionaceous plants.