Etymology
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intra- 
word-forming element meaning "within, inside, on the inside," from Latin preposition intra "on the inside, within, in, into;" of time, "during, in the course of," related to inter "between," from PIE *en-t(e)ro-, from root *en "in." Commonly opposed to extra-, and compare inter-. The use of intra as a prefix was rare in classical Latin.
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intra-peritoneal (adj.)

also intraperitoneal, "within the cavity of the peritoeum," 1835, from intra- "within" + peritoneal (see peritoneum).

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intra-personal (adj.)
also intrapersonal, 1853, from intra- "within" + personal.
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intra-uterine (adj.)
also intrauterine, 1820; see intra- "within" + uterine.
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intra-cellular (adj.)
also intracellular, "existing or happening inside a cell," 1842; see intra- "within" + cellular.
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intra-psychic (adj.)
also intrapsychic, 1902, from intra- "within" + psychic.
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intra-orbital (adj.)
also intraorbital, 1836, from intra- "within" + orbit (n.) + -al (1).
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intra-genic (adj.)
also intragenic, "occurring within a gene," 1937, from intra- "within" + gene + -ic.
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