"Directrix" is a word in ENGLISH

directrix ENGLISH
Definition:

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.

directrix ENGLISH
Definition:

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.

directrix ENGLISH
Definition:

A directress.

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What salesman has the slickest line?A hair grease salesman.

aim ENGLISH

The pointing of a weapon, as a gun, a dart, or an arrow, in the line of direction with the …

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angle ENGLISH

The inclosed space near the point where two lines meet; a corner; a nook.

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angle ENGLISH

The difference of direction of two lines. In the lines meet, the point of meeting is the vertex of the …

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apsis ENGLISH

One of the two points of an orbit, as of a planet or satellite, which are at the greatest and …

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base ENGLISH

The point or line from which a start is made; a starting place or a goal in various games.

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base ENGLISH

A line in a survey which, being accurately determined in length and position, serves as the origin from which to …

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bitangent ENGLISH

A line that touches a curve in two points.

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burin ENGLISH

The cutting tool of an engraver on metal, used in line engraving. It is made of tempered steel, one end …

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catenary ENGLISH

The curve formed by a rope or chain of uniform density and perfect flexibility, hanging freely between two points of …

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center ENGLISH

A point equally distant from the extremities of a line, figure, or body, or from all parts of the circumference …

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centrolinead ENGLISH

An instrument for drawing lines through a point, or lines converging to a center.

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centrolineal ENGLISH

Converging to a center; -- applied to lines drawn so as to meet in a point or center.

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circle ENGLISH

A plane figure, bounded by a single curve line called its circumference, every part of which is equally distant from …

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circumscribe ENGLISH

To draw a line around so as to touch at certain points without cutting. See Inscribe, 5.

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concentre ENGLISH

To draw or direct to a common center; to bring together at a focus or point, as two or more …

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cone ENGLISH

A solid of the form described by the revolution of a right-angled triangle about one of the sides adjacent to …

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conjugate ENGLISH

Presenting themselves simultaneously and having reciprocal properties; -- frequently used in pure and applied mathematics with reference to two quantities, …

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contention ENGLISH

A point maintained in an argument, or a line of argument taken in its support; the subject matter of discussion …

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converge ENGLISH

To tend to one point; to incline and approach nearer together; as, lines converge.

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converging ENGLISH

Tending to one point; approaching each other; convergent; as, converging lines.

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