1) Elementary geometry
Found on
https://www.crosswordclues.com/clue/bicone
A bicone or dicone (Bi- comes from Latin, Di- from Greek.) is the three-dimensional geometric shape swept by revolving a rhombus around one of its axes of symmetry. Alternatively, one can view a bicone as the surface created by joining two identical right circular cones base-to-base. == Related polyhedra == A bicone can be seen as a polyhedral lim...
Found on
http://en.wikipedia.org/wiki/Bicone
an object shaped like two cones with their bases together.
Found on
https://www.infoplease.com/dictionary/bicone
No exact match found.
