Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
GRIMALDI, n. A name given to an ugly or unprepossessing-looking person (Abd.7 1925). Also grimalder (Sc. 1911 S.D.D. Add.).
[From Joseph Grimaldi, a famous Drury Lane clown of the early 19th c., in association with grim.]