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A dark box constructed for viewing transparent pictures, with or without a lens.

An herb (Peucedanum graveolens), the seeds of which are moderately warming, pungent, and aromatic, and were formerly used as a soothing medicine for children; -- called also dill-seed. Dr. Prior.

nother, or through different mediums, as air, water, or glass, and esp. through different lenses; -- distinguished from catoptrics, which refers to reflected light.

Causing divergence of rays; as, a divergent lens.

An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct. W. H. Wollaston.

A commercial name for textile fabrics, cottons, woolens, linen, silks, laces, etc., -- in distinction from groceries. [U.S.]

An arrangement of a fleet in a wedge or Encyc. Dict. Echelon lens (Optics), a large lens constructed in several parts or layers, extending in a succession of annular rings beyond the central lens; - - used in lighthouses.

To make equal in weight; to counterbalance. "More than equiponderated the declension in that direction." De Quincey.

; 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.

A lens of glass to assist the sight. Eyeglasses are used singly or in pairs.

The lens, or combination of lenses, at the eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed. Collimating eyepiece. See under Collimate. -- Negative, or Huyghenian, eyepiece, an eyepiece consisting of two plano-convex lenses with their curved sur…

To form by art and labor; to manufacture; to produce; as, to fabricate woolens.

The variation of words by declension, comparison, or conjugation; inflection.

Syntactical change of form of words, as by declension or conjugation; inflection. Express the syntactical relations by flexion. Sir W. Hamilton.

An Indian bustard (Otis aurita). The Bengal floriken is Sypheotides Bengalensis. [Written also florikan, floriken, florican.]

Belonging to,or concerning, a focus; as, a focal point. Focal distance, or length,of a lens or mirror (Opt.), the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center. --Focal distance of a telescope, the distance of the image of an object from th…

, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror.

A lantern having a lamp surrounded by a hollow cylindrical Fresnel lens.

ce. The term is often rather indiscriminately applied to any large sailing vessel. The gallens . . . were huge, round-stemmed, clumsy vessels, with bulwarks three or four feet thick, and built up at stem and stern, like castels. Motley.

A small South American deer (Furcifer Chilensis), with simple forked horns. [Written also guemul.]