单词：trimorphism
fundamentally distinct, as is the case with titanium dioxide, which
crystallizes in the forms of rutile, octahedrite, and brookite. See
Pleomorphism.
n. The coexistence among individuals of the same species
of three distinct forms, not connected, as a rule, by intermediate
gradations; the condition among individuals of the same species of
having three different shapes or proportions of corresponding parts; --
contrasted with polymorphism, and dimorphism.
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