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English-Thai Dictionary

directrix

N เส้น คงที่

Webster's 1828 Dictionary

DIRECTRIX

n.A female who governs or directs.

Webster's 1913 Dictionary

DIRECTRIX

Di *rect "rix, n.; pl. E. Directrixes (, L. Directrices (.

1. A directress. [R.] Jer. Taylor.

2. (Geom.) (a ) A line along which a point in another line moves, or which in any way governs the motion of the point and determines the position of the curve generated by it; the line along which the generatrix moves in generating a surface. (b ) A straight line so situated with respect to a conic section that the distance of any point of the curve from it has a constant ratio to the distance of the same point from the focus.

New American Oxford Dictionary

directrix

di rec trix |diˈrektriks dəˈrɛktrɪks | ▶noun ( pl. directrices |-trəˌsēz | ) Geometry a fixed line used in describing a curve or surface. ORIGIN early 18th cent.: from medieval Latin, literally ‘directress, ’ based on Latin dirigere ‘to guide. ’

Oxford Dictionary

directrix

directrix |dɪˈrɛktrɪks, dʌɪ -| ▶noun ( pl. directrices |-trɪsiːz | ) Geometry a fixed line used in describing a curve or surface. ORIGIN early 18th cent.: from medieval Latin, literally ‘directress ’, based on Latin dirigere ‘to guide ’.