GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Areola , n.; pl. Areolæ . [L. areola, dim. of area: cf. F. aréole. See Area.]
   An interstice or small space, as between the cracks of the surface in certain crustaceous lichens; or as between the fibers composing organs or vessels that interlace; or as between the nervures of an insect's wing.
   1913 Webster
   (Anat. & Med.) The colored ring around the nipple, or around a vesicle or pustule.
   1913 Webster