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intransigent
intransitive
intranuclear
intraocular
intraocular lens
intraparty
intraperitoneal
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introgression
in·tro·gres·sion [ ìntrə grésh'n ]


noun 
Definition:
 
incorporation of genes: the incorporation of genes from one species into the gene pool of another as a result of hybridization
[Mid-17th century. <intro- + -gression "going," as in progression]

in·tro·gres·sant [ ìntrə gréss'nt ] adjective
in·tro·gres·sive [ ìntrə gréssiv ] adjective
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