CONE

noun

1. A surface of revolution formed by rotating a segment of a line around another line that intersects the first line.
2. A solid of revolution formed by rotating a triangle around one of its altitudes.
3. A space formed by taking the direct product of a given space with a closed interval and identifying all of one end to a point.

verb

1. To fashion into the shape of a cone.
2. To form a cone shape.
3. (frequently followed by "off") To segregate or delineate an area using traffic cones