Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
LUSCIOUS, adj. Sultry, suffocating, of weather (Rxb. a.1838 Jam. MSS. XI. 111).
[Orig. doubtful. Luscious is used in Eng. dial. = overpowering, of a smell, but this may be a different word.]