What does teratogenic mean?
Teratogenic describes an agent or exposure capable of causing abnormal fetal development. In medical and toxicological usage, the term is especially associated with substances that can produce structural malformations in an embryo or fetus, including certain drugs, chemicals, and radiation exposures. A substance described as teratogenic may pose a particular developmental risk during pregnancy, although the severity of that risk depends on the dose, timing, and duration of exposure. The word is formal and clinical rather than everyday vocabulary. It also does not mean simply “dangerous”: mutagenic, for instance, refers specifically to effects on DNA or chromosomes, whereas teratogenic focuses on disturbed development. The distinction matters in medicine, public health, pharmacology, and workplace safety. The adjective commonly appears in phrases such as “teratogenic effects,” “teratogenic risk,” and “teratogenic substances.” Its use often carries serious clinical or regulatory significance because developmental abnormalities can have profound and lasting consequences.
adjectiveCausing abnormal development in an embryo or fetus, especially the development of structural malformations or birth defects.
- Causing abnormal development or structural malformations in an embryo or fetus.
"The drug was considered teratogenic and was therefore contraindicated during pregnancy."
"Laboratory tests found the compound to be teratogenic in animal studies."
"Patients were warned that the treatment could have serious teratogenic effects if taken during pregnancy."
The word's Greek root means “monster,” but modern medicine uses it for any agent capable of disrupting development—not merely one producing literal monsters.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does teratogenic come from?
Teratogenic is a Latinized formation combining the Greek element terat-, from teras, meaning “monster,” with -genic, meaning “producing” or “originating.” The Greek root entered medical vocabulary through teratology and the study of congenital malformations, while the associated noun teratogen names an agent capable of causing them. English cognates such as teratogenesis and teratology retain the same element, and teratoma belongs to the older medical tradition of describing tumor-like growths as monstrous formations.
Related word forms
How teratogenic is actually used
Formal medical, toxicological, and regulatory terminology, used especially for drugs, chemicals, radiation, infections, and other exposures that may disturb embryonic or fetal development. It implies a developmental hazard rather than general toxicity.
Easily confused with teratogenic
A teratogen is an agent capable of causing abnormal fetal development, whereas teratogenic is the adjective describing that capacity or effect.
Mutagenic describes something capable of causing genetic mutations, while teratogenic describes something capable of causing abnormal embryonic or fetal development, though a teratogen may act through mutagenic mechanisms.