Definition of "teratology" [ter•a•tol•o•gy]

• The biological study of birth defects. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "What the word teratogenic means (teratology is the study of abnormalities in physical development)."
• "MOOS: He finally coughed out the word teratology (ph) correctly, a spelling bee sure can sting."
• "In addition, the trainee will see patients who have questions regarding prenatal diagnosis and teratology."