teratological
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ter·a·tol·o·gy
(tĕr′ə-tŏl′ə-jē)n.
The biological study of birth defects.
ter′a·to·log′i·cal (-ə-tl-ŏj′ĭ-kəl) adj.
ter′a·tol′o·gist n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.