excubant,a.rare (pedantic).|ˈɛkskjuːbənt| [ad. L. excubant-em, pr.pple. of excubāre to lie on guard, f.ex- out + cubāre to lie down.] Keeping watch. 1831T. L. Peacock Crotchet Castle xviii. 186 The enemy may be still excubant; and we had better not disperse till daylight.