Lāb'a-rūm, n.
n. [Late Lat., Late Gr. λάβαρον, so called by the Emperor Constantine, from the Celt. lavar, word, sentence, command (sc. douē), of God, in commemoration of his vision of a flaming cross in the heavens, with the inscription, In hoc signo vince, or vince.]
- The standard borne before the Emperor Constantine after his conversion to Christianity. It was a long pike, having a transverse beam, to which was attached a silken vail, wrought with images of the monarch and his children, and on the top was a crown of gold inclosing the mysterious monogram representing the cross, with the initial letters of the name of Christ.
- Any standard or flag. [Rare.]