See Also: polytypism(dictionary)

polytypism (iou)



polytypism noun. M20.
[from POLYTYPIC + -ISM.]
Crystallography. A kind of polymorphism in which a substance occurs in a number of crystalline modifications (polytypes) which differ only in one of the dimensions of the unit cell. M20.
Biology. The occurrence of several variant forms within a single species. M20.
'polytypy noun = POLYTYPISM 2 M20.