Cordon-sanitaire definition

A barrier designed to prevent a disease or other undesirable condition from spreading.

A chain of buffer states organized around a ideologically dangerous or potentially hostile nation.

A barrier restraining free movement of people or goods, so as to keep a disease, infection, etc. from spreading from one locality into another.

A belt of countries serving to isolate another country and check its aggressiveness or lessen its influence.

A barrier designed to prevent a disease or other undesirable condition from spreading.

(by extension) Any barrier to the spread of anything deemed undesirable.