What is the definition or description of: mmr?

Combined vaccine: It is a comination vaccine to prevent three diseases measles, mumps and rubella.

Immunization shot: This is a combination of mumps, measles, and rubella. Commonly given in infancy, and then a booster shot given later. The booster could be in 6th grade, some other grade, when discovered non-immune at pregnancy, or otherwise mandated by your state. If you have escaped all of these opportunities, and only remember your childhood vaccines, seek out a booster shot at your annual physical.