Vexillar
Pronunciation : Vex"il*lar
Part of Speech : Vex"il*la*ry,
Etymology : [Cf. F. vexillaire, L. vexillarius a standard bearer.]
Definition : 1. Of or pertaining to an ensign or standard.
2. (Bot.)
Defn: Of or pertaining to the vexillum, or upper petal of papilionaceous flowers. Vexilary ?stivation (Bot.), a mode of ?stivation in which one large upper petal folds over, and covers, the other smaller petals, as in most papilionaceous plants.
Source : Webster's Unabridged Dictionary, 1913