What term is used to describe a cluster of birth defects caused by a single teratogenic agent?

The term used to describe a cluster of birth defects caused by a single teratogenic agent is "teratogenic syndrome." This refers to the specific pattern of malformations that arise from exposure to a teratogen, which is an agent that causes malformation or abnormal development of an embryo or fetus. A well-known example of a teratogenic syndrome is the "fetal alcohol syndrome," which occurs due to maternal alcohol consumption during pregnancy. Teratogenic syndromes can vary widely in their specific effects and manifestations, depending on factors such as the timing of exposure, the dosage, and the genetic susceptibility of the fetus.