cone (kəʊn)  
—n  
1.  a. a geometric solid consisting of a plane base bounded by a closed curve, often a circle or an ellipse, every point of which is joined to a fixed point, the vertex, lying outside the plane of the base. A right circular cone has a vertex perpendicularly above or below the centre of a circular base. Volume of a cone: 1⁄3πr²h, where r is the radius of the base and h is the height of the cone 
b. See also conic section a geometric surface formed by a line rotating about the vertex and connecting the peripheries of two closed plane bases, usually circular or elliptical, above and below the vertex  
2.  anything that tapers from a circular section to a point, such as a wafer shell used to contain ice cream 
3.  a. the reproductive body of conifers and related plants, made up of overlapping scales, esp the mature female cone, whose scales each bear a seed 
b. Technical name: strobilus a similar structure in horsetails, club mosses, etc  
4.  a small coneshaped bollard used as a temporary traffic marker on roads 
5.  Also called: retinal cone any one of the coneshaped cells in the retina of the eye, sensitive to colour and bright light 
—vb  
6.  (tr) to shape like a cone or part of a cone 
[C16: from Latin cōnus, from Greek kōnus pine cone, geometrical cone] 
cone (kōn)
n.
A solid body having a circle for its base and sides inclined so as to meet at a point above the base.
See cone cell.
cone (kōn) Pronunciation Key
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