- 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.
- 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, especially 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.
Origin of cone
Examples from the Web for cones
He may not have been working the cones, but it looked as though his underlings were.Christie Aides Can Keep Bridgegate Emails Under Wraps
April 10, 2014
Though King and Malcolm X met only once, Cones demonstrates how they understood and utilized their synergy.The Essential Civil-Rights Reading List
Samuel G. Freedman
August 27, 2013
Transplanting RPE cells grown from stem cells might rejuvenate the eye's rods and cones, restoring lost vision.Saving Sight, Testing Faith
May 16, 2011
Cones they looked like, rather, with rounded tops and fluted walls.
But I confess they seem to stick in the stomach as the pitch of the cones sticks on the hands.The Book of Khalid
Fertile catkins and cones on the end of last year's branchlets.Trees of the Northern United States
Austin C. Apgar
Or the impressions were cones in incomplete, or crescentic basins.The Book of the Damned
The pyramids of Memphis seem at sunrise to be cones of pink light.Thais
- 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: 1/3 π r ² h, where r is the radius of the base and h is the height of the cone
- 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 vertexSee also conic section
- anything that tapers from a circular section to a point, such as a wafer shell used to contain ice cream
- the reproductive body of conifers and related plants, made up of overlapping scales, esp the mature female cone, whose scales each bear a seed
- a similar structure in horsetails, club mosses, etcTechnical name: strobilus
- a small cone-shaped bollard used as a temporary traffic marker on roads
- Also called: retinal cone any one of the cone-shaped cells in the retina of the eye, sensitive to colour and bright light
- (tr) to shape like a cone or part of a cone
Word Origin and History for cones
1560s, from Middle French cone (16c.) or directly from Latin conus "a cone, peak of a helmet," from Greek konos "cone, spinning top, pine cone," perhaps from PIE root *ko- "to sharpen" (cf. Sanskrit sanah "whetstone," Latin catus "sharp," Old English han "stone").
- A solid body having a circle for its base and sides inclined so as to meet at a point above the base.
- cone cell
- A three-dimensional surface or solid object in which the base is a circle and upper surface narrows to form a point. The surface of a cone is formed mathematically by moving a line that passes through a fixed point (the vertex) along a circle.
- A rounded or elongated reproductive structure that consists of sporophylls or scales arranged spirally or in an overlapping fashion along a central stem, as in conifers and cycads. For example, the familiar woody pinecone is actually the female cone, made up of ovule-bearing scales. The smaller male cones of the pine consist of thin overlapping microsporophylls. These produce pollen that is carried by the wind to fertilize ovules in the female cones. When the seeds in the female cones mature, the cones of many pine species expand to release them. In some pine species, cones release seeds only in response to the presence of fire. See also strobilus.
- One of the cone-shaped cells in the retina of the eye of many vertebrate animals. Cones are extremely sensitive to light and can distinguish among different wavelengths. Cones are responsible for vision during daylight and for the ability to see colors. Compare rod.