Reg"nant (-nant), a. [L. regnans, -antis, p. pr. of regnare to reign: cf. F r'egnant. See Reign.]
1.
Exercising regal authority; reigning; as, a queen regnant.
2.
Having the chief power; ruling; predominant; prevalent.
"A traitor to the vices
regnant."
Swift.
© Webster 1913.