American Heritage® Dictionary of the English Language, Fourth Edition
- n. A small simple eye, found in many invertebrates, usually consisting of a few sensory cells and a single lens.
- n. A marking that resembles an eye, as on the tail feathers of a male peacock; an eyespot.
Century Dictionary and Cyclopedia
- n. A little eye; an eye-spot; a stemma; one of the minute simple eyes of insects and various other animals. In insects ocelli or stemmata are generally situated on the crown of the head, between the great compound eyes, whose simple elements they resemble in structure; but they are sometimes the only organs of vision.
- n. One of the simple elements or facets of a compound eye. See cut of compound eye, under eye.
- n. In Hydromedusæ, a pigment-spot at the base of the tentacles, or combined with other marginal bodies, in some cases provided with refractive structures which recall the crystalline cones of some other low invertebrates. Also called ocellicyst.
- n. One of the round spots of varied color, consisting of a central part (the pupil) framed in a peripheral part, such as characterize the tail of a peacock or the wing of an argus-pheasant. The ring immediately adjoining the pupil is called the iris, and the exterior circle or ring is the atmosphere. An ocellus may be bi- or tripupillate, blind (without pupil), fenestrate (with transparent pupil), nictitant (with lunate pupil), simple (with only iris and pupil), compound (with two or more rings), etc. See cut above.
- n. See the adjectives.
- n. A simple eye consisting of a single lens and a small number of sensory cells
- n. An eyelike marking in the form of spot or ring of colour, as on the wing of a butterfly or the tail of a peacock
GNU Webster's 1913
- n. A little eye; a minute simple eye found in many invertebrates.
- n. An eyelike spot of color, as those on the tail of the peacock.
- n. an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color
- n. an eye having a single lens
- From Latin ocellus ("little eye"), from oculus ("eye") (Wiktionary)
- Latin, diminutive of oculus, eye. (American Heritage® Dictionary of the English Language, Fourth Edition)
“In dinoflagellates, four types of eye-spots are known: type A, an independent structure that is not membrane-bound; type B, an independent membrane-bound structure; type C, structure as part of a chloroplast; and type D, an elaborate eye-like structure called ocellus”
“All have compound eyes and may or may not have a single ocellus over each eye.”
“Aquila In nubibus Imperator literatorum, columen literarum, abyssus eruditionis, ocellus Europae, Scaliger.”
“The Ciona Î²Î³-crystallin is only expressed in the palps and in the otolith, the pigmented sister cell of the light-sensing ocellus.”
“There is genetic variation among individuals for genes that affect ocellus number, but the developmental effects of that variation are prevented by the system of buffering (Waddington 1953, 1957).”
“If a sufficiently large perturbation is introduced, the developmental buffering capacity is overcome and the genetic variation for ocellus number is revealed.”
“The head oblong, slightly narrowed posteriorly and emarginate behind, longitudinally striated, the striæ diverging from the centre at the anterior ocellus; at half the distance between the posterior ocelli and the margin of the vertex the striæ are transverse.”
“Black; the head and thorax strongly punctured; the mandibles, clypeus, a line above extending to the anterior ocellus, the emargination of the eyes, a spot at their vertex and a line at their outer orbits, yellow; the antennæ reddish-yellow, with the scape pale yellow in front and a narrow fuscous line above; the yellow marking more or less stained orange.”
“Black; the face above the clypeus, as high as the anterior ocellus, reddish-yellow; the extreme edge of the clypeus, the labrum and base of the mandibles ferruginous; the antennæ reddish-yellow.”
“Frontal lobes: in Psyllidae, two lobes or swellings more or less completely divided by a suture in which an ocellus is situated.”
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