Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
This entry has not been updated since then but may contain minor corrections and revisions.
BIRSK, n. “Cartilage, gristle” (Cai.1 1905 in E.D.D. Suppl.).
[Met. form of O.N. brjōsk, cartilage (Zoëga). See Brisk, id.]