Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
¶HORSO, n.2 A shell fish, Mya arenaria (Ork. 1929 Marw.). [′hɔrso]
[For hors-, cf. horse-mussel, s.v. Horse, + -o, Ork. suffix.]