Isodiabatic I`so*di`a*bat"ic, a. [Iso- + Gr. ? to pass through.] (Physics) Pertaining to the reception or the giving out of equal quantities of heat by a substance. --Rankine. Isodiabatic lines or curves, a pair of lines or curves exhibiting, on a diagram of energy, the law of variation of the pressure and density of a fluid, the one during the lowering, and the other during the raising, of its temperature, when the quantity of heat given out by the fluid during any given stage of the one process is equal to the quantity received during the corresponding stage of the other. Such lines are said to be isodiabatic with respect to each other. Compare Adiabatic., Geodetic Ge`o*det"ic, Geodetical Ge`o*det"ic*al, a. Of or pertaining to geodesy; obtained or determined by the operations of geodesy; engaged in geodesy; geodesic; as, geodetic surveying; geodetic observers. Geodetic line or curve, the shortest line that can be drawn between two points on the elipsoidal surface of the earth; a curve drawn on any given surface so that the osculating plane of the curve at every point shall contain the normal to the surface; the minimum line that can be drawn on any surface between any two points., Curve Curve (k[^u]rv), a. [L. curvus bent, curved. See Cirb.] Bent without angles; crooked; curved; as, a curve line; a curve surface., Curve Curve, n. [See Curve, a., Cirb.] 1. A bending without angles; that which is bent; a flexure; as, a curve in a railway or canal. 2. (Geom.) A line described according to some low, and having no finite portion of it a straight line. Axis of a curve. See under Axis. Curve of quickest descent. See Brachystochrone. Curve tracing (Math.), the process of determining the shape, location, singular points, and other peculiarities of a curve from its equation. Plane curve (Geom.), a curve such that when a plane passes through three points of the curve, it passes through all the other points of the curve. Any other curve is called a curve of double curvature, or a twisted curve., Curve Curve, v. t. [imp. & p. p. Curved (k?rvd); p. pr. & vb. n. Curving.] [L. curvare., fr. curvus. See Curve, a., Curb.] To bend; to crook; as, to curve a line; to curve a pipe; to cause to swerve from a straight course; as, to curve a ball in pitching it., Curve Curve, v. i. To bend or turn gradually from a given direction; as, the road curves to the right.