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The hypothetical line on the surface of the earth fixed by international or general agreement as a boundary on one side of which the same day shall have a different name and date in the calendar from its name and date on the other side.

The upper stratum of coal, as nearest the light or surface.

A solid figure or body inclosed by ten plane surfaces. [Written also, less correctly, decaedron.]

Deviation from a horizontal line; gradual descent of surface; inclination downward; slope; -- opposed to acclivity, or ascent; the same slope, considered as descending, being a declivity, which, considered as ascending, is an acclivity.

Extending far below the surface; of great perpendicular dimension (measured from the surface downward, and distinguished from high, which is measured upward); far to the bottom; having a certain depth; as, a deep sea. The water where the brook is deep. Shak.

At or to a great depth; far below the surface; as, to sink deeply.

The act of defacing, or the condition of being defaced; injury to the surface or exterior; obliteration.

A deviation of the rays of light toward the surface of an opaque body; inflection; diffraction.

The process of giving a dull or ground surface to glass by acid or by mechanical means. Knight.

Soft and fair; -- said of the skin or a surface; as, a delicate cheek; a delicate complexion.

The act of stripping off covering, or removing the surface; a making bare.

The process of removing the vitreous glaze from porcelain, leaving the dull luster of the surface of ivory porcelian. Knight.

A falling in of the surface; a sinking below its true place; a cavity or hollow; as, roughness consists in little protuberances and depressions.

The quality of being deep; deepness; perpendicular measurement downward from the surface,or horizontal measurement backward from the front; as, the depth of a river; the depth of a body of troops.

Inclination downward; a descending way; inclined or sloping surface; declivity; slope; as, a steep descent.

ge upon plate, by submitting it to chemical agents; to bring to view. To develop a curved surface on a place (Geom.), to produce on the plane an equivalent surface, as if by rolling the curved surface so that all parts shall successively touch the plane.

Capable of being developed. J. Peile. Developable surface (Math.), a surface described by a moving right line, and such that consecutive positions of the generator intersect each other. Hence, the surface can be developed into a plane.

Moisture from the atmosphere condensed by cool bodies upon their surfaces, particularly at night. Her tears fell with the dews at even. Tennyson.

Resembling a dew-covered surface; appearing as if covered with dew.

ssessing the properties of, a species of caustic curves formed by refraction. See Caustic surface, under Caustic.