n. [ See Pseudomorphous. ] 1. An irregular or deceptive form. [ 1913 Webster ]

2. (Crystallog.) A pseudomorphous crystal, such as a crystal consisting of quartz, but having the cubic form of fluor spar, the fluor crystal having been changed to quartz by a process of substitution. [ 1913 Webster ]

n. (Crystallog.) The state of having, or the property of taking, a crystalline form unlike that which belongs to the species. [ 1913 Webster ]

a. [ Gr. &unr_;; pseydh`s false + morfh` form: cf. F. pseudomorphe. ] Not having the true form. [ 1913 Webster ]

Pseudomorphous crystal, a crystal which has a form that does not result from its own powers of crystallization. [ 1913 Webster ]