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A cone (1)-(3)


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

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


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 unit of volume, applied solely to marijuana and only while it is in a smokable state; roughly 1.5 cubic centimetres, depending on use.
  8. Any of the small cone-shaped structures in the retina.[1]
  9. (slang) The bowl piece on a bong.
  10. (slang) The process of smoking cannabis in a bong.
  11. (slang) A cone-shaped cannabis joint.
  12. (slang) A passenger on a cruise ship (so-called by employees after traffic cones, from the need to navigate around them)
  13. (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
  14. A shell of the genus Conus, having a conical form.
  15. 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.



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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.


  1. 1.0 1.1 1.2 1.3 The Illustrated Oxford Dictionary, Oxford University Press, 1998




cone m (plural cones)

  1. cone (conical shape)