Scottish National Dictionary (1700–)
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First published 1971 (SND Vol. VIII).
This entry has not been updated since then but may contain minor corrections and revisions.
STAIR, n.2 A porpoise, gen. in pl. of a school of porpoises (s.Ayr. 1971).
[This appears to be ad. Gael stair(ean), (a) stepping-stone(s), from the similarity in appearance.]