Etymology
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Words related to -ia

ophthalmia (n.)

"inflammation of the eye, conjunctivitis," late 14c., obtalmia, from Medieval Latin obtalmia and Old French obtalmie, ultimately from Greek ophthalmia, from ophthalmos (see ophthalmo-) + -ia. The corrected spelling is attested from late 16c.

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orthodontia (n.)

"the branch of dentistry concerned with the treatment of irregularities of the teeth and jaws," 1849, from ortho- "straight, regular" + Greek odon (genitive odontos) "tooth" (from PIE root *dent- "tooth") + abstract noun ending -ia.

paraesthesia (n.)

also paresthesia, "abnormal sensation, hallucination of the senses," 1835, from para- (1), here meaning "disordered," + Greek aisthēsis "perception, feeling" (from PIE root *au- "to perceive") + abstract noun ending -ia.

paronychia (n.)

"inflammation beside a fingernail," 1590s, from Latin, from Greek paronykhia "whitlow," from para- "beside" (see para- (1)) + onyx "nail" (see nail (n.)) + abstract noun ending -ia.

Patagonia 

region at the southern extremity of South America, with -ia + Patagon, name given by Europeans to the Tehuelche people who inhabited the coasts of the region, sometimes said to mean literally "large-foot," from Spanish and Portuguese pata "paw, animal foot" (see patten) in reference to the people's llama-skin shoes. But elsewhere said to be from Patagon, name of a dog-headed monster in the prose romance "Amadís de Gaula" (1508) by Garci Ordóñez de Montalvo (which also might have yielded California). Related: Patagonian.

Poinsettia (n.)

type of much-cultivated American plant conspicuous for its large scarlet floral leaves, from the genus name (1836), Modern Latin, in recognition of Joel R. Poinsett (1779-1851), U.S. ambassador to Mexico, who is said to have brought the plant to the attention of botanists in 1828, + abstract noun ending -ia.

polyandria (n.)

1751 in botany, in reference to a class of flowers having 20 or more stamens; 1809 of human relationships (implied in polyandrian), from poly- "many" andr-, stem of aner "man, husband" (from PIE root *ner- (2) "man"), which is used in botany to mean "stamen, having stamens," + -ia "condition of." Late Greek polyandria meant "populousness," a polyandrion was "place where many assemble." Related: Polyandric.

polydipsia (n.)

in pathology, "excessive thirst," 1650s, from Greek polydipsios "very thirsty," from polys "much, many" (from PIE root *pele- (1) "to fill") + dipsa "thirst" (a word of unknown origin) + -ia "condition of."

progeria (n.)

fatal genetic disease of children causing rapid aging, 1902, Modern Latin, from Greek progeros "prematurely old;" from pro "before, sooner" (see pro-) + geras "old man" (see geriatric) + abstract noun ending -ia.

proteinuria 

"presence of abnormal levels of protein in the urine," 1911, Modern Latin, from French protéinurie; see protein + urine + abstract noun ending -ia.

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