noun Biology.
an areola.

1855–60; < French aréole < Latin āreola a small open space. See areola Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
areole (ˈærɪəʊl)
1.  biology a space outlined on a surface, such as an area between veins on a leaf or on an insect's wing
2.  a sunken area on a cactus from which spines, hairs, etc, arise

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Central spines radiate from the center of the areole and tend to project outward from the plant surface rather than lie flat.
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