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A measure of how much a conic section deviates from being circular.

4.

A line in relation to a curve such that the distance between the curve and the line approaches zero as they tend to infinity.

5.

A curve consisting of two distinct and similar branches, formed by the intersection of a plane with a right circular cone when the plane makes a greater angle with the base than does the generator of the cone.

6.

A curved structure, normally in the vertical plane, that spans an opening.

7.

A fixed reference line, situated on the convex side of a conic section, that is used when defining or calculating its eccentricity.

9.

A conic section formed by the intersection of a cone by a plane parallel to its side.

11.

A curve formed by the intersection of a plane with a right circular cone.

Down:

1.

The curve assumed approximately by a heavy uniform cord or chain hanging freely from two points not in the same vertical line.

3.

The curve described by a projectile, rocket, or the like in its flight.

8.

A conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone.

10.

The set of all points, lines, or surfaces that satisfy a given requirement.