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.
¶BILL AUK, n.comb. ? The razorbill, Alca torda, or the puffin, Fratercula arctica.Dmf. 1845 Stat. Acc.2 VIII. 71:
Red-throated diver, bill auk, common gull.