from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An agent, such as a virus, a drug, or radiation, that causes malformation of an embryo or fetus.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any agent or substance which can cause malformation of an embryo or birth defects.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any agent that interferes with normal embryonic development: alcohol or thalidomide or X-rays or rubella are examples
From terato- + -gen (Wiktionary)