Etymology
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-itis 
word-forming element in medicine denoting "diseases characterized by inflammation" (of the specified part), Modern Latin, from Greek -itis, feminine of adjectival suffix -ites "pertaining to." Feminine because it was used with an implied nosos "disease," a feminine noun; especially in arthritis (nosos) "(disease) of the joints." Arthritis (16c.) was one of the earliest appearances of the suffix in English and from it the suffix was abstracted in other uses.
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bursitis (n.)
"inflammation of a bursa," 1834; see bursa + -itis.
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conjunctivitis (n.)

"inflammation of the conjunctiva," 1821, from conjunctiva + -itis "inflammation."

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urethritis (n.)
1823, medical Latin, from urethra + -itis "inflammation."
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sinusitis (n.)
"inflammation of the sinuses," 1896; see sinus + -itis "inflammation."
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pericarditis (n.)

"inflammation of the pericardium," 1799, from pericardium + -itis "inflammation."

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dermatitis (n.)

"inflammation of the skin," 1851; see dermat- + -itis "inflammation."

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mesenteritis (n.)

"inflammation of the mesentery," 1772; see mesentery + -itis "inflammation."

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retinitis (n.)

"inflammation of the retina," 1821, from retina + -itis "inflammation." Retinitis pigmentosa is attested by 1856.

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