| retained menstruation | An accumulation of menstrual blood in the vagina. (12 Dec 1998) |
|---|---|
| retained placenta | Incomplete separation of the placenta and its failure to be expelled at the usual time after delivery of the child. Synonym: incarcerated placenta. (05 Mar 2000) |
| retainer | <dentistry> A gadget that the orthodontist gives you to wear after the orthodntist removes your braces. The retainer attaches to your upper teeth and holds them in the correct position. You wear the retainer at night to make sure that none of your teeth move while your jaw hardens and your teeth get strongly attached to your jaw. (08 Jan 1998) |