Al″lo‐morph (�), n.(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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.