te·rat·o·gen 
(tə-rătə-jən, tĕrə-tə-)
(tə-rătə-jən, tĕrə-tə-)n.
An agent, such as a virus, a drug, or radiation, that causes malformation of an embryo or fetus.
- immoral
- immoralist
- immorality
- immorally
- immortal
- immortality
- immortalization
- immortalize
- immortally
- immortelle
- immotile
- immotility
- immovability
- immovable
- immovable feast
- immovableness
- immovably
- immune
- immune globulin
- immune reaction
- immune response
- immune serum globulin
- immune system
- immunity
- immunization