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

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

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

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

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

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.

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

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