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.
BILLJOCK, n. A bull.Gall. 1824 MacTaggart Gallov. Encycl. 83:
For, like Billjock amang the kye, They boo at fowk as they gae by.