Intrauterine means "inside the uterus."
A baby grows inside the mother's womb, or uterus. This is called an intrauterine environment.
An intrauterine device (IUD) is an object placed in the uterus to prevent conception and pregnancy.
Katz VL. Reproductive anatomy: Gross and microscopic, clinical correlations. In: Lentz GM, Lobo RA, Gershenson DM, Katz VL, eds. Comprehensive Gynecology. 6th ed. Philadelphia, PA: Elsevier Mosby; 2012:chap 3.