This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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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.

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

n. 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

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

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.

n. See the adjectives.

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

"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"

marking   

double ocellus    orbits of the ocelli   

ocellation    ocellary    ocellar    ocellated   

ocelli