- vexillary⇄adj. 1. (Biology.) of or having to do with a vexillum.
2. of or having to do with an ensign or standard. - vexillary⇄noun in ancient Rome:
a. one of the oldest class of army veterans serving under a special standard.
b. a standardbearer. - vexillary⇄vexillary, adjective, noun, pl.-laries.