Al"lo*morph (#), n. [Gr. other + form.] Min. (a)
Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; -- as, carbonate of lime occurs in the allomorphs calcite and aragonite.
(b)
A variety of pseudomorph which has undergone partial or complete change or substitution of material; -- thus limonite is frequently an allomorph after pyrite.
G. H. Williams.
© Webster 1913.