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.
SPELL, n.2 See Pell, n.3 Formed with prothetic s from wrong division of words in phr. as soor as pell, see quot. and S, letter, 5.Ags. 1868 G. Webster Strathbrachan II. i.:
Now we get up a drop thin blae milk as sour as spell.