Webster's Revised Unabridged Dictionary -- Volume DE

Ey`as (?), n. [F. niais fresh from the nest, a derivative fr. L. nidus nest. E. an eyas for a nias. See Nest, and cf. Nias, Jashawk.] (Zoöl.) A nesting or unfledged bird; in falconry, a young hawk from the nest, not able to prey for itself. Shak J. H. Walsh

Ey"as, a. Unfledged, or newly fledged. [Obs.]

Like eyas hawk up mounts unto the skies,
His newly budded pinions to assay.
Spenser.

Ey"as·mus`ket (?), n. [Eyas + muske the brid.] An unfledged or young male sparrow hawk. [Obs.] Shak.

Eye (ī), n. [Prob. fr. nye, an eye being for a nye. See Nye.] (Zoöl.) A brood; as, an eye of pheasants.

Eye (ī), n. [OE. eghe, eighe, eie, eye, AS. eáge; akin to OFries. āge, OS. ōga, D. oog, Ohg. ouga, G. auge, Icel. auga, Sw. öga, Dan. öie, Goth. augō; cf. OSlav. oko, Lith. akis, L. okulus, Gr. οκκοσ, eye, οσσε, the two eyes, Skr. akshi. √10, 212. Cf. Diasy, Ocular, Optic, Eyelet, Ogle.]

1. The organ of sight or vision. In man, and the vertebrates generally, it is properly the movable ball or globe in the orbit, but the term often includes the adjacent parts. In most invertebrates the eyes are immovable ocelli, or compound eyes made up of numerous ocelli. See Ocellus.

Description of illustration: a b Conjunctiva; c Cornea; d Sclerotic; e Choroid; f Cillary Muscle; g Cillary Process; h Iris; i Suspensory Ligament; k Prosterior Aqueous Chamber between h and i; l Anterior Aqueous Chamber; m Crystalline Lens; n Vitreous Humor; o Retina; p Yellow spot; q Center of blind spot; r Artery of Retina in center of the Optic Nerve.

The essential parts of the eye are inclosed in a tough outer coat, the sclerotic, to which the muscles moving it are attached, and which in front changes into the transparent cornea. A little way back of cornea, the crystalline lens is suspended, dividing the eye into two unequal cavities, a smaller one in front filled with a watery fluid, the aqueous humor, and larger one behind filled with a clear jelly, the vitreous humor. The sclerotic is lined with a highly pigmented membrane, the choroid, and this is turn is lined in the back half of the eyeball with the nearly transparent retina, in which the fibers of the optic nerve ramify. The choroid in front is continuous with the iris, which has a contractile opening in the center, the pupil, admitting light to the lens which brings the rays to a focus and forms an image upon the retina, where the light, falling upon delicate structures called rods and cones, causes them to stimulate the fibres of the optic nerve to transmit visual impressions to the brain.