Vex-īl'lum, n.
n.; pl. VEX-IL'LA. [Lat., a standard, a flag, from vehere, vectum, to bear, carry; O. Fr. vexille, O. Sp. vexillo, It. vessillo.]
Sense 1. (Rom. Antiq.) (a.) A flag or standard. (b.) A company of troops.
Sense 2. (Bot.) The upper petal of a papilionaceous flower. Martyn.