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directrix

Pronunciation: /dɪˈrɛktrɪks, dʌɪ-/
Definition of directrix

noun (plural directrices /-trɪsiːz/)

Geometry
  • a fixed line used in describing a curve or surface.

Origin:

early 18th century: from medieval Latin, literally 'directress', based on Latin dirigere 'to guide'

directrix in other Oxford dictionaries

Definition of directrix in the US English dictionary

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