retrograde menstruation n.
A flow of menstrual blood into the fallopian tubes.
- Retrograde rotation
noun rotation in an opposite direction from the typical rotation within a system Examples Venus, Pluto, and Uranus have retrograde rotation in our solar system.
- Retrograde urography
retrograde urography n. X-ray examination of the urinary tract following the injection of a contrast agent directly into the bladder, ureter, or renal pelvis. Also called cystoscopic urography.
verb (used without object) 1. to go backward into an earlier and usually worse condition: to retrogress to infantilism. 2. to move backward. verb (intransitive) 1. to go back to an earlier, esp worse, condition; degenerate or deteriorate 2. to move backwards; recede 3. (biology) to develop characteristics or features of lower or simpler organisms; […]
[re-truh-gresh-uh n] /ˌrɛ trəˈgrɛʃ ən/ noun 1. the act of retrogressing; movement backward. 2. Biology. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure. retrogression ret·ro·gres·sion (rět’rə-grěsh’ən) n. The act or process of deteriorating or declining. A return to a less complex biological state or stage.