1. (noun)
Jacob's ladder, Greek valerian, charity, Polemonium caeruleum, Polemonium van-bruntiae, Polymonium caeruleum van-bruntiae
- pinnate-leaved European perennial having bright blue or white flowers
2. (noun)
Jacob's ladder, jack ladder, pilot ladder
- (nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps