ocellus


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Related to ocellus: simple eye, ocelli

o·cel·lus

 (ō-sĕl′əs)
n. pl. o·cel·li (ō-sĕl′ī′)
1. A simple eye, found in many invertebrates, consisting of a number of sensory cells and often a single lens.
2. A marking that resembles an eye, as on the tail feathers of a male peacock; an eyespot.

[Latin, diminutive of oculus, eye; see okw- in Indo-European roots.]

o·cel′lar (ō-sĕl′ər) adj.

ocellus

(ɒˈsɛləs)
n, pl -li (-laɪ)
1. (Zoology) the simple eye of insects and some other invertebrates, consisting basically of light-sensitive cells
2. (Biology) any eyelike marking in animals, such as the eyespot on the tail feather of a peacock
3. (Botany) botany
a. an enlarged discoloured cell in a leaf
b. a swelling on the sporangium of certain fungi
[C19: via New Latin from Latin: small eye, from oculus eye]
oˈcellar adj
ocellate, ocellated adj
ˌocelˈlation n

o•cel•lus

(oʊˈsɛl əs)

n., pl. o•cel•li (oʊˈsɛl aɪ)
1. the simple eye of many invertebrates, consisting of retinal cells, pigments, and nerve fibers.
2. an eyelike spot, as on a peacock feather.
[1810–20; < Latin: little eye, diminutive of oculus eye; see -elle]
o•cel′lar, adj.
oc•el•lat•ed (ˈɒs əˌleɪ tɪd, oʊˈsɛl eɪ tɪd) oc•el•late (ˈɒs əˌleɪt, oʊˈsɛl ɪt, -eɪt) adj.

o·cel·lus

(ō-sĕl′əs)
Plural ocelli (ō-sĕl′ī′)
1. A small, simple eye or eyespot, found in many invertebrates.
2. A marking that resembles an eye, as on the wings of some butterflies.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ocellus - an eye having a single lens
eye, oculus, optic - the organ of sight
ommatidium - any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods
2.ocellus - an eyelike marking (as on the wings of some butterflies)ocellus - an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color
marking - a pattern of marks
Translations
References in classic literature ?
Each ocellus is furnished with its own lid, and the apt can, at will, close as many of the facets of his huge eyes as he chooses.
This eye structure seemed remarkable in a beast whose haunts were upon a glaring field of ice and snow, and though I found upon minute examination of several that we killed that each ocellus is furnished with its own lid, and that the animal can at will close as many of the facets of his huge eyes as he chooses, yet I was positive that nature had thus equipped him because much of his life was to be spent in dark, subterranean recesses.
Electroretinogram characteristics and the spectral mechanisms of the median ocellus and the lateral eye in Limulus polyphemus.
In the descriptions, POL is the distance between the inner edges of the two lateral ocelli; OL - between the inner edges of a lateral ocellus and the median ocellus; OOL is the distance from the outer edge of a lateral ocellus to the compound eye; OPL - from the posterior edge of a lateral ocellus to the occipital carina; and TL - from the posterior edge of the eye to the occipital carina.
2 in SL; colour in life generally light grey to dark greyish brown, including median fins, with dark-edged greenish spot just below lateral-line origin; small juveniles bright yellow with diagonal blue bands on upper head and anterodorsal portion of body, and prominent ocellus on middle of dorsal fin.
Measurements and abbreviations used include the following: the post-ocellar distance (POL) is the distance between the inner margins of the posterior ocelli; the ocellar-ocular distance (OOL) is the distance from the outer edge of a posterior ocellus to the inner margin of the compound eye.
Frontal ridge above medial ocellus wide, not sulcate, pitted; below medial ocellus, increasingly obsolete.
Ocellar triangle about two ocellus diameters from boundary between occiput and frons.
Electrical activities of a type of electroretinogram recorded from the ocellus of a jellyfish, Polyorchis petzicillatus (Hydromedusae).
2C: 1br); distance between eye and ocellus about one third as long as interocellar distance; laterotergites IX of female strongly produced posteriorly along midline, their apices exposed beyond apex of scutellum (Figs.
Protapanteles (Protapanteles) enephes has the ocelli relatively large, posterior imaginary tangent to fore ocellus transecting deeply the hind pair of ocelli (Figure 8); notauli indistinct (Figure 9) propodeum rugo-rugulose (Figure 10), tergite I tending to be widened posteriorly and with the sculpture of its horizontal part intrincated (Figure 11), inner spur of the hind tibia slightly longer than half basitarsus (Figures 5, 13), cheeks bright yellow to rusty (Figure 3).