1. A flag or standard, especially of a Roman military unit
   "The legion marched behind its vexillum"
    
2. The web and shaft of a feather; the vane
   "The vexillum of the peacock's tail feathers creates its iconic display"
    
3. The large upper petal of a pea or bean flower; the standard
   "The bright vexillum of the sweet pea flower attracts pollinators"

Derived forms: vexilla

Encyclopedia: Vexillum