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1. A small, specialized, cushionlike area on a cactus from which hairs, glochids, spines, branches, or flowers may arise.
2. See areola.

[French aréole, from Latin āreola, small open space; see areola.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Biology) biology a space outlined on a surface, such as an area between veins on a leaf or on an insect's wing
2. (Botany) a sunken area on a cactus from which spines, hairs, etc, arise
ˈareoˌlate adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈɛər iˌoʊl)

[1855–60; < French < Latin]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
areole of lighter color is distinguished around the micropyle.
Samara orbicular, 2.8-3.3 cm in diameter; lateral wing membranous, continuous at base and apex, not cleft at apex but broadly and shallowly emarginate, nearly glabrate at maturity; dorsal winglet 8-10 mm wide, prolonged upward toward apex of samara and confluent with lateral wing; ventral crest 1-1.5 mm wide, extending from apex of nut upward and confluent with lateral wing; nut inserted above center of lateral wing, persistently thinly sericeous; ventral areole ovate or triangular, 3.5-4 mm high, 2.3-3 mm wide; fruit subtended by a short, obscure and not darkly colored, sparsely pilose 3-lobed disc.
We also were able to regenerate whole plants from shoot slices containing a single areole (Fig 10); however, it took 4 more years to achieve full plant production.
The spines range from black to brown and their number at each areole gradually increases with age.
They are slightly tilted forward in position, with the areole enlarged in the direction opposite to the orientation of the spine (Figures 4(a) and 4(b)), where the bulk of spine muscle fibres attach.
Involucrellum black, merging with black lower layers of thallus; perithecia 1-3 per areole; spores 12-14 [micro]m x 6-7[micro]m Verrucaria fayettensis 3.
The boat's passengers; Blake Doud and Areole Trattner, of Myrtle Creek; and Olaf Myhre III and Edith Myhre, of Riddle; put on lifejackets and used a rope to wade downstream to an island, where a passing fisherman brought them to the bank, Hutson said.
They then bored a hole into the areole and consumed tissue beneath the areole, creating a small gallery in the cactus branch.
cactorum females on host plants were recorded by classifying the attachment of the eggstick to either a glochid at an areole, to a spine, or on the fruit.
The most important attributes for the classification were the quantity of radial thorns and the number of thorns for areole in the cladodes, and the color and weight of the pulp of the fruits.
reticulum of higher orders including imperfect, quadrangular areoles,