[1] : The Collaborative International Dictionary of English v.0.48

truncated \trun"cated\, a.
   1. cut off; cut short; maimed.
      1913 webster

   2. min. replaced, or cut off, by a plane, especially when
      equally inclined to the adjoining faces; as, a truncated
      edge.
      1913 webster

   3. zool. lacking the apex; -- said of certain spiral shells
      in which the apex naturally drops off.
      1913 webster

   truncated cone or truncated pyramid geom., a cone or
      pyramid whose vertex is cut off by a plane, the plane
      being usually parallel to the base.
      1913 webster
see also:
truncated cone truncated pyramid 

[2] : WordNet (r) 2.0

truncated cone
     n : a frustum formed from a cone

Cone >> C Words
Cone, definition of term: Cone
cone_pag1.html

Truncated >> T Words
Truncated, definition of term: Truncated
truncated_pag1.html

Nose Cone >> N Words
Nose Cone, definition of term: Nose Cone
nose+cone_pag1.html

Pine Cone >> P Words
Pine Cone, definition of term: Pine Cone
pine+cone_pag1.html