ter·a·to·gen·ic \|terətō|jenik\adjective alsoter·a·to·genetic\-(ˌ)tōjə̇|ned.ik\ Etymology: International Scientific Vocabulary terat- + -genic or -genetic : tending to cause developmental malformations and monstrosities • ter·a·to·ge·nic·i·ty\-(ˌ)tōjə̇|nisə̇d.ē\noun-es