n 1  :  a polyhedron with two polygonal faces lying in parallel planes and with the other faces parallelograms  2  :  a transparent body that is bounded in part by two nonparallel plane faces and is used to refract or disperse a beam of light  3  :  a crystal form whose faces are parallel to one axis : esp  :  one whose faces are parallel to the vertical axis .
 
 
 
Similar sounding terms:  hy·per·os·mia  hy·po·uri·ce·mia  par·os·mia 
 
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