What does areola mean?
The definition of areola
A*re”o*la, n.; pl. Areolæ.
Etym: [L. areola, dim. of area: cf. F. aréole. See Area.]

1 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.
2 (Anat. & Med.)
The colored ring around the nipple, or around a vesicle or pustule.