Definition of pentahedron noun from the Oxford Advanced Learner's Dictionary

 

pentahedron

 noun
noun
BrE BrE//ˌpentəˈhiːdrən//
 
; NAmE NAmE//ˌpentəˈhiːdrən//
 
; BrE BrE//ˌpentəˈhedrən//
 
; NAmE NAmE//ˌpentəˈhedrən//
 
(geometry)
 
jump to other results
a solid shape with five flat sides Word Origin late 18th cent.: from penta- ‘five’ + -hedron, on the pattern of words such as polyhedron.
See the Oxford Advanced American Dictionary entry: pentahedron