geom
41hyperbolic paraboloid — Geom. a paraboloid that can be put into a position such that its sections parallel to one coordinate plane are hyperbolas, with its sections parallel to the other two coordinate planes being parabolas. Cf. elliptic paraboloid. [1835 45] * * * …
42interior angle — Geom. 1. an angle formed between parallel lines by a third line that intersects them. 2. an angle formed within a polygon by two adjacent sides. [1750 60] * * * …
43Klein bottle — Geom. a one sided figure consisting of a tapered tube the narrow end of which is bent back, run through the side of the tube, and flared to join the wide end, thereby allowing any two points on the figure to be joined by an unbroken line. [1940… …
44line segment — Geom. segment (def. 2b). * * * …
45median point — Geom. centroid (def. 2). * * * …
46Möbius strip — Geom. a continuous, one sided surface formed by twisting one end of a rectangular strip through 180° about the longitudinal axis of the strip and attaching this end to the other. Also called Möbius band. [1900 05; named after A. F. MÖBIUS] * * *… …
47oblique circular cone — Geom. a cone whose surface is generated by lines joining a fixed point to the points of a circle, the fixed point lying on a line that is not perpendicular to the circle at its center. Cf. right circular cone. [‡1950 55] * * * …
48oblique circular cylinder — Geom. a cylinder generated by the revolution of a parallelogram other than a rectangle about one of its sides. Cf. right circular cylinder. * * * …
49obtuse triangle — Geom. a triangle with one obtuse angle. See diag. under triangle. * * * …
50oval of Cassini — Geom. the locus of a point such that the product of the distances from the point to two fixed points is constant. [after Italian geometer and astronomer Giovanni Domenico Cassini (1625 1712)] * * * …
