1. (n.) 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.

2. (n.) A variety of pseudomorph which has undergone partial or complete change or substitution of material; -- thus limonite is frequently an allomorph after pyrite.

IC analysis accidence add adjoin affixation agglutinate allomorph allonge anchor annex append appendix attach belay bound morpheme burden cement cinch clamp clinch coda codicil commentary complicate conjoin conjugation cramp cutting declension decorate derivation difference of form enclitic encumber engraft envoi epilogue fasten fix formative free form glue on graft grapple hitch on immediate constituent analysis infix infixation inflection interlineation interpolation join with knit make fast marginalia moor morph morpheme morphemic analysis morphemics morphology morphophonemics note ornament paradigm paste on plus postfix postscript prefix prefixation proclitic put to put with radical rider rivet root saddle with scholia screw up secure set set to slap on stem subjoin suffix suffixation superadd superpose tack on tag tag on tail theme tighten trice up trim unite with word-formation