Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
WRIGGLE, n. A smoke-deflector in a chimney, a windskew (see Wind, n.1, 2.(22)) (Ags. 1808 Jam. s.v. Wind-skew).
[Orig. somewhat uncertain, poss. simply a specialised n. use of Eng. wriggle, to twist or turn about.]