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.
HEIDMAIST, adj. Also -most. Topmost (Sc. 1902 E.D.D.), highest up. Gen.Sc.Sc. 1901 N.E.D. (s.v. Headmost):
Gang up the glen to the heidmost house.