Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
COVETTA, n. “The name given to a plane used for moulding framed work, called also a Quarter-round” (Sc. 1825 Jam.2, Abd. 1948 (per Abd.27); Kcb.10 1940).
[Cf. Eng. cavetto' a hollow moulding (N.E.D.), from Lat. cavus, hollow.]
