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.
CRELLAG, n. A bluebottle (Cai. (Latheron) 1916 T.S.D.C. II.; Cai.1 c.1920). [′kɹɛlɑg]
[Cf. Gael. creithleag, gad-fly, horse-fly.]