Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
HOOL, n. Also hul (Jak.). A little hill, a knoll. Now mostly in place-names (Sh. 1908 Jak. (1928)). [hul]Sh. 1956 Shetland News (4 Dec.):
She pointed to the knowe . . . and said it was the “trow's hool”, or knowe.
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"Hool n.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 17 Aug 2022 <http://www.dsl.ac.uk/entry/snd/hool>