Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BULLA, n. “Brother” (Gall. 1824 MacTaggart Gallov. Encycl. 100; Kcb.4 c.1900). Cf. Billy, n.1 [′bʌlə]