jacob's ladder

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Noun jacob's ladder has 2 senses

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
--₁ is a kind of polemonium
Jacob's ladder, jack ladder, pilot ladder - (nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps
--₂ is a kind of ladder