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Glossary of Crystallography Terms
beginning with letter P
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point group Tweet Definition of point group Like Definition of point group on Facebook
noun 
  1. (mathematics) a group of isometries leaving a fixed point
     
polymorph Tweet Definition of polymorph Like Definition of polymorph on Facebook
noun 
  1. (biology) any organism that shows polymorphism
  2. (chemistry),(geology) any substance or mineral that forms different types of crystal
     
polymorphism Tweet Definition of polymorphism Like Definition of polymorphism on Facebook
noun 
  1. The ability to assume different forms or shapes.
  2. (context, crystallography) The ability of a solid material to exist in more than one form or crystal structure; pleomorphism.
  3. (context, biology) The coexistence, in the same locality, of two or more distinct forms independent of sex, not connected by intermediate gradations, but produced from common parents.
  4. (context, computer science) The feature of object-oriented programming that allows a method to have several definitions, depending on the types of the arguments it is called with.
     
prism Tweet Definition of prism Like Definition of prism on Facebook
noun 
  1. (mathematics) A polyhedron with parallel ends of the same size and shape, the other faces being parallelogram-shaped sides.
  2. A transparent block in the shape of a prism (typically with triangular ends), used to split or reflect light.
  3. A crystal in which the faces are parallel to the vertical axis.
     
pyramid Tweet Definition of pyramid Like Definition of pyramid on Facebook
noun 
  1. An ancient massive construction with a square or rectangular base and four triangular sides meeting in an apex, such as those built as tombs in Egypt or as bases for temples in Mesoamerica.
  2. A construction in the shape of a pyramid, usually with a square or rectangular base.
  3. (geometry) A solid with triangular lateral faces and a polygonal (often square or rectangular) base.
  4. A pyramid scheme.
(seeCites)      
pyritohedron Tweet Definition of pyritohedron Like Definition of pyritohedron on Facebook
noun (plural pyritohedra)
  1. (mathematics) an irregular dodecahedron, consisting of identical but irregular pentagons
    1. the shape of a crystal of pyrite
     

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