Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. Mathematics The surface generated by a straight line, the generator, passing through a fixed point, the vertex, and moving along a fixed curve, the directrix.
 n. Mathematics A right circular cone.
 n. The figure formed by a cone, bound or regarded as bound by its vertex and a plane section taken anywhere above or below the vertex.
 n. Something having the shape of this figure: "the cone of illuminated drops spilling beneath a street lamp” ( Anne Tyler).
 n. Botany A unisexual reproductive structure of gymnospermous plants such as conifers and cycads, typically consisting of a central axis around which there are scaly, overlapping, spirally arranged sporophylls that develop pollenbearing sacs or naked ovules or seeds.
 n. Botany A similar structure that produces spores on club mosses, horsetails, and spike mosses.
 n. Botany Any reproductive structure resembling a cone, such as a cluster of hop or alder fruits.
 n. Physiology One of the photoreceptors in the retina of the eye that is responsible for daylight and color vision. These photoreceptors are most densely concentrated in the fovea centralis, creating the area of greatest visual acuity.
 n. Any of various gastropod mollusks of the family Conidae of tropical and subtropical seas, having a conical, often vividly marked shell and the ability to inflict a poisonous, sometimes fatal sting.
 transitive v. To shape (something) like a cone or a segment of one.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A surface of revolution formed by rotating a segment of a line around another line that intersects the first line.
 n. A solid of revolution formed by rotating a triangle around one of its altitudes.
 n. 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.
 n. A unit of volume, applied solely to marijuana and only while it is in a smokable state; roughly 1.5 cubic centimetres, depending on use.
 n. The bowl piece on a bong.
 n. The process of smoking cannabis in a bong.
 n. A coneshaped cannabis joint.
 n. A passenger on a cruise ship (socalled by employees after traffic cones, from the need to navigate around them)
 n. Given a diagram F : J → C, a cone consists of an object N of C, together with a family of morphisms ψX : N → F(X) indexed by all of the objects of J, such that for every morphism f : X → Y in J, . Then N is the vertex of the cone, whose sides are all the ψX indexed by Ob(J) and whose base is F. The cone is said to be "from N to F" and can be denoted as (N, ψ).
 v. To fashion into the shape of a cone.
from the GNU version of the Collaborative International Dictionary of English
 n. A solid of the form described by the revolution of a rightangled triangle about one of the sides adjacent to the right angle;  called also a right cone. More generally, any solid having a vertical point and bounded by a surface which is described by a straight line always passing through that vertical point; a solid having a circle for its base and tapering to a point or vertex.
 n. Anything shaped more or less like a mathematical cone.
 n. The fruit or strobile of the Coniferæ, as of the pine, fir, cedar, and cypress. It is composed of woody scales, each one of which has one or two seeds at its base.
 n. A shell of the genus Conus, having a conical form.
 transitive v. To render coneshaped; to bevfl like whe circwlar segoent of a cone.
from The Century Dictionary and Cyclopedia
 n. In geometry: A solid generated by the revolution of a rightangled triangle upon one of its sides as an axis.
 n. A solid the surface of which consists of a circle, which forms its base, and the envelop of all the limited straight lines which join the circumference of the circle to a fixed point lying without the perpendicular to the circle from its center: specifically termed an oblique or scalene cone. See conic.
 n. In modern geom., any surface generated by a line one point in which is fixed.
 n. Anything shaped like a cone.
 n. In anat.: The conarium, or pineal body of the brain.
 n. One of the minute coneshaped structures forming with the socalled “rods” a layer of the retina. See retina.
 n. In conchology, a shell of the family Conidoe, characterized by its obconic form.
 n. The hill surrounding the crater of a volcano, formed by the gradual accumulation of the ejected material.
 n. A stormcone.
 n. The ventplug in the barrel of a firearm.
 n. In spinning, one of the taper drums in the headstock of a mule, known respectively us the backingoff and drawingup cones.
 To shape so as to resemble the segment of a cone, as the tire or tread of a carwheel.
 n.
 n. The crystalline lens of the compound or faceted eye (ommateum) of an insect.
 n. A pair of equal cones with parallel axes, but with the small base of one in line with the large base of the other, at such a distance that an endless belt on their surfaces or an idle transmittingwheel between them can transmit power from one to the other. In either form the device may be used to transmit a varying velocity ratio by adjusting belt or wheel so that a large circumference of driver is opposite a small circumference of driver, or the reverse.
 To bear cones: said of coniferous trees.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. a shape whose base is a circle and whose sides taper up to a point
 n. a visual receptor cell in the retina that is sensitive to bright light and to color
 n. coneshaped mass of ovule or sporebearing scales or bracts
 v. make coneshaped
 n. any coneshaped artifact
Etymologies
Examples

Ring cone system: A variation on the cone drive system is called the ring cone system  the motor has a metal cone mounted on its shaft, and the whole motor can be moved in and out, so that the cone drives a rubber ring connected to the wheelhead at variable speeds.

The top/narrow end of the cone is the inlet for any pump/device to ships/tanks etc. to capture oil until they fix the leak.

As a hurricane approaches land, they lay out a pretty wide swath of possibilities which they call the cone of uncertainty.

And that does include what we call the cone of uncertainty.

I want to talk to you about what you call the cone of uncertainty.

It could be one way or the other, but the center of what we call the cone is right over Panama City.

Pictures like "Snoball," which portrays a snowcone shack with a yellow topped cone is softened by his gentle sense of humor: it is almost a "Pop" painting.
John Seed: Rod Penner: Rust on Poles, Crumbling Asphalt, Light Hitting the Grass (PHOTOS)

NoPickles: waffle cone with fried chicken and maple syrup and butter. a taste of harlem in cone form in midtown. should they offer, i should get royalties.

Pizzacone graced Midtown with the almighty pizza in cone form (on 5th Ave.btw. 32+33rd.)

This Echinacea flower has a spiny head referred to as a cone, which is where it gets its common name the purple cone flower..
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