(botany) vexillum

A company of soldiers (especially in ancient Rome) grouped under the same flag.

plural of vexillation

plural of vexillator

standard-bearer

(vexillology) To gather or to lead an army under a flag. / (figuratively) To organise or to lead people under a common cause or goal. / (vexillology) To make a flag; To sew or print a flag.

(botany) Having vexilla.

A flag, banner, or standard. / A company of troops serving under one standard. / The sign of the cross. / (botany) The upper petal of a papilionaceous flower.

The study of flags

One who studies flags.