Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
¶WHOON, n. Variant form of Eng. hone, for sharpening a razor, knife, etc. See W, letter, 7.(2)(i).Rxb. 1729 Sc. Hist. Review V. 271:
One case with two raisors. One whoon, one strap.