Pseudo-symmetry Pseu`do-sym"me*try, n. [Pseudo- + symmetry.] (Crystallog.) A kind of symmetry characteristic of certain crystals which from twinning, or other causes, come to resemble forms of a system other than that to which they belong, as the apparently hexagonal prisms of aragonite. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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