areola

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areola

Anatomy any small circular area, such as the pigmented ring around the human nipple or the inflamed area surrounding a pimple

areola

[ə′rē·ə·lə]
(anatomy)
The portion of the iris bordering the pupil of the eye.
A pigmented ring surrounding a nipple, vesicle, or pustule.
A small space, interval, or pore in a tissue.
References in periodicals archive ?
2A-H; b) small size of spore body (33) 38 (45) gm; and c) the presence of several rows of marginal sterile polygonal areoles.
The thin, circular areole in the micropylar end of the sclerotesta
Boke (1941, 1951, 1952, 1953, 1955, 1956, 1957a, 1957b, 1959, 1961) studied the apical meristem and the development of areoles and tubercles in various species of tribe Cacteae (e.
subcrenata by there being two or more free veins in costal areoles in B.
Nebraska records are near the northern edge of the range for this southern species that consists of closely aggregated, squamulose to lobate areoles.
Cacti, by the way, are distinguished from other succulents by having areoles.
Cactuses - which have spines or thorns growing out of regularly spaced areoles - can be barrel-shaped, tall and branching, or irregularly shaped and close to the ground.
Serpocaulon is defined as having commonly anastomosing veins, chevron-shaped areoles, 1-10 series of areoles between the costa and pinnae margin, excurrent veinlets in the areoles, as well as a generally long-creeping, branched rhizome, with peltate, clathrate rhizome scales (at least in the central or basal portion).
Pronotum with large, distinct, bulbous hood, cleft posteriorly to receive anterior portion of a compressed elevation formed by two greatly enlarged hemispherical lateral carinae; areoles of hemelytra very large, rectangular, and vitreous Galeatus Curtis
The smallest areas outlined by veins, referred to as areoles, may be described in terms of shape, size, orientation and presence or absence of freely ending veinlets.