1. a ladder seen by Jacob in a dream, reaching from the earth to heaven. Gen. 28:12.
2. Naut. a. Also called jack ladder, pilot ladder. a hanging ladder having ropes or chains supporting wooden or metal rungs or steps.
b. any ladderlike arrangement aloft other than one of rattled shrouds.
Pronunciation: ( jā'kubz-lad'ur),[key] —n. any of various plants belonging to the genus Polemonium, of the phlox family, esp. P. caeruleum (or P. van-bruntiae), having blue, cup-shaped flowers and paired leaflets in a ladderlike arrangement.