Jacob's ladder

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. pinnate-leaved European perennial having bright blue or white flowers
• Syn:
Greek valerian, charity, Polemonium caeruleum, Polemonium van-bruntiae, Polymonium caeruleum van-bruntiae
• Hypernyms:
polemonium
2. (nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps
• Syn:
jack ladder, pilot ladder
• Topics:
seafaring, navigation, sailing
• Hypernyms:
ladder