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A picture produced by the Röntgen rays upon a sensitive surface, photographic or fluorescent, especially a picture of opaque objects traversed by the rays.

es to it, -- used for collecting hay, or other light things which are spread over a large surface, or for breaking and smoothing the earth.

To rub along the surface of; to graze.[Obsoles.] Was he not in the . . . neighborhood to death and might not the bullet which rased his cheek have gone into his head South. Sometimes his feet rased the surface of water, and at others the skylight almost flattened his nose. Beckford.

a exorhiza) which has strong aërial roots like a screw pine. The roots have a hard, rough surface, and are used by the natives for graters and rasps, whence the common name.

The act or process of removing a cataract, by applying the needle to its anterior surface, and depressing it into the vitreous humor in such a way that front surface of the cataract becomes the upper one and its back surface the lower one. Dunglison.

ing; a reed (see Illust. (i) of Molding); one of several set close together to decorate a surface; also, decoration by means of reedings; -- the reverse of fluting.

A chain or range of rocks lying at or near the surface of the water. See Coral reefs, under Coral.

To be sent back; to rebound as from a surface; to revert; to return. Whose virtues will, I hope, Reflect on Rome, as Titan's rays on earth. Shak.

Thrown back after striking a surface; as, reflected light, heat, sound, etc.

Throwing back light, heat, etc., as a mirror or other surface.

The return of rays, beams, sound, or the like, from a surface. See Angle of reflection, below. The eye sees not itself, But by reflection, by some other things. Shak.

Something having a polished surface for reflecting light or heat, as a mirror, a speculum, etc.

Luster; special brilliancy of surface; -- used esp. in ceramics to denote the peculiar metallic brilliancy seen in lustered pottery such as majolica; as, silver reflet; gold reflet.

Reflection; the light reflected from an illuminated surface to one in shade. Yon gray is not the morning's eye, 'Tis but the pale reflex of Cynthia's brow. Shak. On the depths of death there swims The reflex of a human face. Tennyson.

of refraction (Opt.), the angle which a refracted ray makes with the perpendicular to the surface separating the two media traversed by the ray. -- Conical refraction (Opt.), the refraction of a ray of light into an infinite number of rays, forming a hollow cone. This occurs when a ray of light is passed through cryst…

power to refract, or turn from a direct course; pertaining to refraction; as, refractive surfaces; refractive powers. Refractive index. (Opt.) See Index of refraction, under Index. -- Absolute refractive index (Opt.), the index of refraction of a substances when the ray passes into it from a vacuum. -- Relative refr…

One of the grand districts or quarters into which any space or surface, as of the earth or the heavens, is conceived of as divided; hence, in general, a portion of space or territory of indefinite extent; country; province; district; tract. If thence he 'scappe, into whatever world, Or unknown region. Milton.…

To remove the outer surface of, as of an old hewn stone, so as to give it a fresh appearance.

back or returning; retrogression; retrogradation. Sir T. Browne. Edge of regression (of a surface) (Geom.), the line along which a surface turns back upon itself; -- called also a cuspidal edge. -- Regression point (Geom.), a cusp.

The elevations and surface undulations of a country. Guyot. Relief valve, a valve arranged for relieving pressure of steam, gas, or liquid; an escape valve.