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directrix

Syllabification: (di·rec·trix)
Pronunciation: /diˈrektriks/
Definition of directrix

noun (plural directrices /-trəˌsēz/)

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 British & World English dictionary

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