Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
JACOB, prop. n. Sc. combs.: 1. Jacob's ladder, (1) the plant belladonna, Atropa belladonna (Ayr. 1825 Jam.; Lnk., Uls.4 1959); (2) a marbles game, played with five marbles over a pitch scored with parallel lines like the rungs of a ladder (Cai. 1959); 2. Jacob's sword, the plant Iris pseudacorus (Abd. 1886 B. and H. 278, Uls.4 1948).