Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
CART, n.3 A crab-shaped louse (Bch. 1938 (per Abd.22)). In pl.: the skin disease caused by this louse (Id.). Also attrib.Bch. 1925 (per Abd.15):
Cart saw is an ointment or salve used as a remedy for the disease known as carts.