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Толковый словарь английского языка - parabola

 

Parabola

parabola
noun Etymology: New Latin, from Greek parabolē, literally, comparison Date: 1579 a plane curve generated by a point moving so that its distance from a fixed point is equal to its distance from a fixed line ; the intersection of a right circular cone with a plane parallel to an element of the cone, something bowl-shaped (as an antenna or microphone reflector)
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1.
  n. an open plane curve formed by the intersection of a cone with a plane parallel to its side, resembling the path of a projectile under the action of gravity. Etymology: mod.L f. Gk parabole placing side by side, comparison (as PARA-(1), bole a throw f. ballo) ...
Толковый словарь английского языка Oxford English Reference

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