abbreviation of Centers for Disease Control, renamed 1970 from earlier U.S. federal health lab, originally Communicable Diseases Center (1946). Since 1992, full name is Centers for Disease Control and Prevention, but the usual initialism (acronym) remains CDC.

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Definitions of CDC from WordNet

cdc (n.)
a federal agency in the Department of Health and Human Services; located in Atlanta; investigates and diagnoses and tries to control or prevent diseases (especially new and unusual diseases);
Synonyms: Center for Disease Control and Prevention