Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
RACE, n.4 The shimmering appearance of rising air on a hot day, especially over the brow of a slope (Ork. 1929 Marw.).
[Norw. ræs, a streaming of water, a strong steady stream of air along a fjord.]