evolvent
/i'vɔlvәnt/
中文释义
渐开线, 切展线
英文释义
n. The involute of a curve. See Involute, and Evolute.
例句
1
A curve from which another curve, called the involute or evolvent, is described by the end of a thread gradually wound upon the former, or unwound from it
2
It is the locus of the centers of all the circles which are osculatory to the given curve or evolvent.