Etymology
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malformed (adj.)

"ill-formed, having defects of formation," 1801, from mal- + formed, past participle of form (v.).

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spongiform (adj.)
"resembling a sponge," 1774, from Latin spongia "sponge" (see sponge (n.)) + forma "form, shape" (see form (n.)).
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reniform (adj.)

in science, "having the form or shape of a (human) kidney," 1753, from Latin renes "kidneys" (see renal) + -form.

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cribriform (adj.)

"sieve-like, riddled with small holes," 1741, from Latin cribrum "a sieve" (from PIE root *krei- "to sieve") + -form.

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moniliform (adj.)

"resembling a string of beads," 1787, from Latin monile "collar, necklace," from PIE *mon- "neck, nape of the neck" + -form.

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oviform (adj.)

"egg-shaped," 1680s, from ōvi-, combining form of Latin ōvus "egg" (see ovum) + forma "form, shape" (see form (n.)).

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pro forma 

also proforma, Latin, literally "for form's sake, by way of formality;" from pro (prep.) "on behalf of" (see pro-) + formā, ablative of forma (see form (n.)). A pro forma invoice is one sent to the purchaser in advance of the ordered goods.

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lebensform (n.)

"any type of human activity that involves values" (Wittgenstein), 1937, from German Lebensform, from Leben "life" (see life) + Form (see form (n.)).

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vermiform (adj.)
"worm-shaped, worm-like in form," 1730, from Modern Latin vermiformis, from Latin vermis "worm" (from PIE root *wer- (2) "to turn, bend") + forma "form" (see form (n.)).
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cruciform (adj.)

"cross-shaped," 1660s, from Modern Latin cruciformis, from Latin crux (genitive crucis) "stake, cross" (see crux) + forma "form, shape" (see form (n.)).

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