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parabolical a. 譬喻;寓言似的 譬喻;寓言似的 parabolical adj 1: resembling or expressed by parables [ synonym: { parabolic}, { parabolical}] 2: having the form of a parabola [ synonym: { parabolic}, { parabolical}] Parabolic \ Par` a* bol" ic\, Parabolical \ Par` a* bol" ic* al\, a. [ Gr. paraboliko` s figurative: cf. F. parabolique. See { Parable}.] [ 1913 Webster] 1. Of the nature of a parable; expressed by a parable or figure; allegorical; as, parabolical instruction. [ 1913 Webster] 2. [ From { Parabola}.] ( Geom.) ( a) Having the form or nature of a parabola; pertaining to, or resembling, a parabola; as, a parabolic curve. ( b) Having a form like that generated by the revolution of a parabola, or by a line that moves on a parabola as a directing curve; as, a parabolic conoid; a parabolic reflector; a parabolic antenna. [ 1913 Webster PJC] { Parabolic conoid}, a paraboloid; a conoid whose directing curve is a parabola. See { Conoid}. { Parabolic mirror} ( Opt.), a mirror having a paraboloidal surface which gives for parallel rays ( as those from very distant objects) images free from aberration. It is used in reflecting telescopes. { Parabolic spindle}, the solid generated by revolving the portion of a parabola cut off by a line drawn at right angles to the axis of the curve, about that line as an axis. { Parabolic spiral}, a spiral curve conceived to be formed by the periphery of a semiparabola when its axis is wrapped about a circle; also, any other spiral curve having an analogy to the parabola. [ 1913 Webster]
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