Os″ti‐ole (?), n. [L. ostiolum a little door, dim. of ostium a door: cf. F. ostiole.] (Bot.) (a) The exterior opening of a stomate. See Stomate. (b) Any small orifice.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.