Geometry .

a solid whose surface is generated by a line passing through a fixed point and a fixed plane curve not containing the point, consisting of two equal sections joined at a vertex.

a plane surface resembling the cross section of a solid cone.

anything shaped like a cone

sawdust piled up in a great cone; the cone of a volcano.

ice-cream cone.

Botany .

the more or less conical multiple fruit of the pine, fir, etc., consisting of overlapping or valvate scales bearing naked ovules or seeds; a strobile.

a similar fruit, as in cycads or club mosses.

Anatomy . one of the cone-shaped cells in the retina of the eye, sensitive to color and intensity of light. Compare rod ( def. 17 ) .

one of a series of cone-shaped markers placed along a road, as around an area of highway construction, esp. to exclude or divert motor vehicles.

(in a taper thread screw or bevel gear) an imaginary cone or frustum of a cone concentric to the axis and defining the pitch surface or one of the extremities of the threads or teeth.

Ceramics . pyrometric cone.

to shape like a cone or a segment of a cone.

noun

conoid , pyramid , raceme , strobile , strobiloid , bobbin , container , fissure , funnel , object , solid , spire