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单词 semiparabola
释义 ˌsemipaˈrabola Math.
[semi- 7 b.]
1. Half of a parabola.
1656Hobbes Six Lessons iv. 34 You ought to have made a Semiparabola on the Diameter AC.1668Phil. Trans. III. 809 When Comets describe a Semi-parabola only.1745Bailey (ed. 10) vol. II, Parabolick Conoid, a solid figure generated by the rotation of a Semi parabola about its Axis.
2. ‘A curve of such a nature that the powers of its ordinates are to each other as the next lower powers of its abscissas’ (Hutton, Math. Dict.).
1728Chambers Cycl. s.v. Parabola, Those Curves are likewise used to be referred to Parabola's wherein axm-1 = ym. as E. gr. ax2 = y3, ax3 = y4, which some call Semi-parabola's.1815Hutton Math. Dict. II. 150/1 Parabolas, that are expressed by the general equation axn-1 = yn..are called semi-parabolas.
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