Etymology
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multiform (adj.)

also multi-form, "having many forms," c. 1600, from French multiforme or Latin multiformis "many-shaped, manifold," from multus "much, many" (see multi-) + forma "shape" (see form (n.)).

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*mel- (2)

Proto-Indo-European root meaning "strong, great." It forms all or part of: ameliorate; amelioration; meliorate; melioration; meliorism; multi-; multiform; multiple; multiply; multitude. It is the hypothetical source of/evidence for its existence is provided by: Greek mala "very, very much;" Latin multus "much, many," melior "better."  

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polymorphous (adj.)

"having or exhibiting many or various forms," 1785, from Greek polymorphos "multiform, of many forms, manifold," from polys "many" (from PIE root *pele- (1) "to fill") + morphē "shape, form," a word of uncertain etymology. Especially of insects: "undergoing a series of marked changes during development." Related: Polymorphic; polymorphously; polymorphousness.

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multiformity (n.)

"diversity of forms; variety of shapes or appearances in one thing," 1580s, from Late Latin multiformitas, from Latin multiformis "many-shaped; manifold; various, diverse," see multi- + form (n.).

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