# cone

## English

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### Pronunciation

•  Audio (US) Sorry, your browser either has JavaScript disabled or does not have any supported player. You can download the clip or download a player to play the clip in your browser. (file)
• Rhymes: -əʊn
A cone (1)-(3)

### Etymology

From Middle French cone, from Latin conus (cone, wedge, peak), from Ancient Greek κῶνος (kônos, cone, spinning top, pine cone)

A commutative diagram of one of the triangular facets of the cone from N to F.
Pine cone (5).

### Noun

cone (plural cones)

1. (geometry) A surface of revolution formed by rotating a segment of a line around another line that intersects the first line.
2. (geometry) A solid of revolution formed by rotating a triangle around one of its altitudes.
3. (topology) 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.
4. Anything shaped like a cone.[1]
5. The fruit of a conifer.[1]
6. An ice cream cone.[1]
7. A traffic cone
8. 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.
9. Any of the small cone-shaped structures in the retina.[1]
10. (slang) The bowl piece on a bong.
11. (slang) The process of smoking cannabis in a bong.
12. (slang) A cone-shaped cannabis joint.
13. (slang) A passenger on a cruise ship (so-called by employees after traffic cones, from the need to navigate around them)
14. (category theory) Given a diagram F : JC, a cone consists of an object N of C, together with a family of morphisms ψX : NF(X) indexed by all of the objects of J, such that for every morphism f : XY in J, $F(f) \circ \psi_X = \psi_Y$. 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).
«Let J be an index category which has an initial object I. Let F be a diagram of type J in C. Then category C contains a cone from F(I) to F
«If category C has a cone from N to F and a morphism from M to N, then category C also has a cone from M to F
15. A shell of the genus Conus, having a conical form.
16. A set of formal languages with certain desirable closure properties, in particular those of the regular languages, the context-free languages and the recursively enumerable languages.

#### Translations

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### Verb

cone (third-person singular simple present cones, present participle coning, simple past and past participle coned)

1. (pottery) To fashion into the shape of a cone.
2. (frequently followed by "off") To segregate or delineate an area using traffic cones
• 2006, Great Britain: Department for Transport, “D5 Single Carriageway Roads”, in Traffic Signs Manual, Part 1[1], The Stationery Office, ISBN 9780115527388, page 140:
The area occupied by the works should be coned off and the usual advance warning signs should be provided on all approaches

### References

1. The Illustrated Oxford Dictionary, Oxford University Press, 1998

## Portuguese

### Etymology

 This entry lacks etymological information. If you are familiar with the origin of this term, please add it to the page as described here.

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" (cognates: Sanskrit sanah "whetstone," Latin catus "sharp," Old English han "stone").

### Noun

cone m (plural cones)

1. (geometry, etc.) cone (conical shape)