A Dictionary of the Older Scottish Tongue (up to 1700)
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First published 1983 (DOST Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
Ostiole, n. [L. ostiolum a little door. Cf. mod. Eng. ostiole a small orifice or opening (1857).] The mouth (of a cylindrical receptacle). —1646 J. Hope Diary 174.
They close the ostiole or potte mouth with a covert of clay
