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Merriam-Webster's Collegiate Dictionary pa·rab·o·la \\pə-ˈra-bə-lə\\ noun ETYMOLOGY New Latin, from Greek parabolē, literally, comparison DATE 1579 1. a plane curve generated by a point moving so that its distance from a fixed point is equal to its distance from a fixed line : the intersection of a right circular cone with a plane parallel to an element of the cone 2. something bowl-shaped (as an antenna or microphone reflector) [parabola 1: F fixed point; CD fixed line; x moving point; AB axis; xy distance from x to CD; pp′ parabola] English Etymology parabola 1570s, from Gk. parabole "parabola, application" (see parable), so called by Apollonius of Perga c.210 B.C.E. because it is produced by "application" of a given area to a given straight line. It had a different sense in Pythagorean geometry. Related: Parabolic. Oxford Advanced Learner's Dictionary-牛津双解-OALD7 parabola para·bola / pE5rAbElE / noun (geometry 几何) a curve like the path of an object thrown into the air and falling back to earth 抛物线 • para·bol·ic / 7pArE5bClik; NAmE -5bB:lik / adj.: parabolic curves 抛物曲线 OLT parabola noun ⇨ curve Webster's Third New International Dictionary, Unabridged pa·rab·o·la \pəˈrabələ\ noun (-s) Etymology: New Latin, from Greek parabolē — more at parable 1. : a plane curve generated by a point so moving that its distance from a fixed point divided by its distance from a fixed line is equal to 1 : a conic section formed by the intersection of a cone with a plane parallel to an element of the cone 2. a. : a bowl-shaped microphone b. : a bowl-shaped antenna to receive and transmit radio waves preferentially in one particular direction [parabola 1: F fixed point; CD fixed line; x moving point; AB axis; xy distance from x to CD; pp′ parabola] |
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