单词 | directrix |
释义 | directrix/dɪˈrɛktrɪks / /dʌɪˈrɛktrɪks/noun (plural directrices /dɪˈrɛktrɪsiːz/ /dʌɪˈrɛktrɪsiːz/) Geometry A fixed line used in describing a curve or surface.In the following, the feet of perpendiculars dropped from points A, B, etc. on the parabola to the directrix will be denoted A ’, B ’, etc....
OriginEarly 18th century: from medieval Latin, literally 'directress', based on Latin dirigere 'to guide'. |
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