Source : Webster's Revised Unabridged Dictionary (1913)

Vexillar \Vex"il*lar\, Vexillary \Vex"il*la*ry\, [Cf. F.
   vexillaire, L. vexillarius a standard bearer.]
   1. Of or pertaining to an ensign or standard.

   2. (Bot.) Of or pertaining to the vexillum, or upper petal of
      papilionaceous flowers.

   {Vexilary [ae]stivation} (Bot.), a mode of [ae]stivation in
      which one large upper petal folds over, and covers, the
      other smaller petals, as in most papilionaceous plants.

Vexillary \Vex"il*la*ry\, n. [L. vexillarius: cf. F.
   vexillaire.]
   A standard bearer. --Tennyson.