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Answer for the clue "Any agent that interferes with normal embryonic development alcohol or thalidomide or X-rays or rubella are examples ", 9 letters:
teratogen

Word definitions for teratogen in dictionaries

WordNet Word definitions in WordNet
n. any agent that interferes with normal embryonic development: alcohol or thalidomide or X-rays or rubella are examples

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1959, from terato- "marvel, monster" + -gen .

Wiktionary Word definitions in Wiktionary
n. (context teratology English) Any agent or substance which can cause malformation of an embryo or birth defects.

Usage examples of teratogen.

Yet over the past few days they had performed antibody testing, osteological analysis, tests for toxic residues and teratogens, as well as numerous other procedures.

Because of heavy environmental toxins and teratogens, the odds were against any child being born strong and healthy.

Yet over the past few days they had performed antibody testing, osteological analysis, tests for toxic residues and teratogens, as well as numerous other procedures.