A cone-shaped concave mirror with a rounded-off tip, whose cross-section is shaped like the tip of a parabola. Most of the light, radio waves, sound, and other radiation that enter the mirror straight on is reflected by the surface and converges on the focus of the parabola, where being concentrated, it can be easily detected. Conversely, radiation emanating from the focal point reflects from the inner surface of the mirror into a fairly direct beam of nearly parallel radiation that can be aimed at a target. Parabolic mirrors are the basis of parabolic antennae, as well as some megaphones and telescopic mirrors.
[puh-rab-uh-lahyz] /pəˈræb əˌlaɪz/ verb (used with object), parabolized, parabolizing. 1. to tell or explain in a parable or parables. [puh-rab-uh-lahyz] /pəˈræb əˌlaɪz/ verb (used with object), parabolized, parabolizing. 1. to form as a or paraboloid. /pəˈræbəˌlaɪz/ verb 1. (transitive) to explain by a parable /pəˈræbəˌlaɪz/ verb 1. (transitive) to shape like a parabola or paraboloid
[puh-rab-uh-loid] /pəˈræb əˌlɔɪd/ noun, Geometry. 1. a surface that can be put into a position such that its sections parallel to at least one coordinate plane are . /pəˈræbəˌlɔɪd/ noun 1. a geometric surface whose sections parallel to two coordinate planes are parabolic and whose sections parallel to the third plane are either elliptical or […]
[par-uh-breyk] /ˈpær əˌbreɪk/ noun 1. . /ˈpærəˌbreɪk/ noun 1. another name for brake parachute
parabulia par·a·bu·li·a (pār’ə-bōō’lē-ə, -byōō’-) n. Abnormality of volition or will, as when one impulse is checked and replaced by another.