1. a person who advocates for or practices eugenics; a supporter of selective breeding to improve human hereditary traits
Usage: historical; often considered offensive in modern usage due to association with discredited and harmful pseudoscience

Examples

• Early 20th-century euthenists promoted controversial theories about human improvement.
• The euthenist movement gained traction in several countries before World War II.
• Modern scientists reject the pseudoscientific claims made by historical euthenists.
• The euthenist ideology has been thoroughly discredited by contemporary genetics and ethics.