n. One who or that which climbs, mounts, or rises; one who ascends by labor or effort.n. In botany, a plant that rises by attaching itself to some support; specifically, in England, the virgin's-bower, Clematis Vitalba.n. plural In ornithology, the birds of the old order Scansores, as the parrots, cockatoos, woodpeckers, etc.: so called from their climbing habits. They have two toes before and two behind.n. A locomotive with driving-wheels fitted to a cog-rail, for ascending steep grades.n. plural Same asclimbing-irons.To climb; mount with effort; clamber.