The Collaborative International Dictionary
Vexillar
Vexillar \Vex"il*lar\, Vexillary \Vex"il*la*ry\, [Cf. F. vexillaire, L. vexillarius a standard bearer.]
Of or pertaining to an ensign or standard.
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(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.
Wiktionary
vexillar
a. 1 Of or relating to an ensign or standard. 2 (context botany English) Of or relating to the vexillum, or upper petal of papilionaceous flowers.