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I-beam (n.)1869; see beam (n.). So called for its shape. I-bar is from 1890; also I-rail (1873).
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Koh-i-noor (n.)famous diamond, one of the British crown jewels after the annexation of Punjab in 1849, from Persian koh-i-nur, literally "mountain of light," from Persian koh "mountain" + Arabic nur "light."
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paracentesis (n.)
Related entries & more "surgical perforation of a cavity of the body for the purpose of evacuation of effused fluid," 1590s, from the medical Latin form of Greek parakentēsis "perforation," from parakentein "to tap," literally "to pierce at the side," from para- "beside" (see para- (1)) + kentein "to prick, stab" (see center (n.)).
parasympathetic (adj.)
Related entries & more in reference to major divisions of the nervous system, 1905, from para- (1) "beside" + sympathetic.
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