| 单词 |
evolvent |
| 释义 |
evolvent, a. and n. Math.|ɪˈvɒlvənt| [ad. L. ēvolvent-em, pr. pple. f. ēvolvĕre: see evolve.] A. adj. That evolves. † evolvent line: the right line (the tangent to the evolute), the extremity of which is the locus of the involute. B. n. 1. The involute of a curve. 2. (See quot. 1862.)
1708tr. Gregory's Prop. Catenaria in Misc. Cur. II. 236 The Evoluent Line UF is a third Proportional to AC and CB. 1727–51Chambers Cycl., Evolvent, in geometry..the curve resulting from the evolution of a curve; in contradistinction to the evolute. 1796in Hutton Math. Dict. 1862F. Hall Hindu Philos. Syst. Introd. 9 note, ‘Originant’ might answer, or ‘evolvent’ [for prakṛiti]; and ‘originate’ or ‘evolute’ for vikṛiti. 1882E. B. Cowell in tr. Sarva-darśana-saṃgraha 221 That which is evolvent only [note, I borrow this term from Dr. Hall.]. |

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