noun. A simple eye, found in many invertebrates, consisting of a number of sensory cells and often a single lens.

noun. A marking that resembles an eye, as on the tail feathers of a male peacock; an eyespot.

noun. A little eye; an eye-spot; a stemma; one of the minute simple eyes of insects and various other animals.

noun. One of the simple elements or facets of a compound eye. See cut of compound eye, under eye.

noun. 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.

noun. 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.

noun. See the adjectives.

noun. A little eye; a minute simple eye found in many invertebrates.

noun. An eyelike spot of color, as those on the tail of the peacock.

noun. A simple eye consisting of a single lens and a small number of sensory cells

noun. An eyelike marking in the form of a spot or ring of colour, as on the wing of a butterfly or the tail of a peacock

noun. an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color

noun. an eye having a single lens

"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"

double ocellus  orbits of the ocelli  

ocellar  ocellary  ocellated  ocellation  

marking  

ocelli