to keep someone in (or out), using a blockade, especially ships in a port
to close or block a road etc., using a barricade
A barrier constructed across a road, especially as a military defence
An obstacle, barrier, or bulwark.
A place of confrontation.
To place in quarantine or isolation.
To self-isolate.
To separate a pure strain of bacteria etc. from a mixed culture.
To separate a substance in pure form from a mixture.
To insulate, or make free of external influence.
To insulate an electrical component from a source of electricity.
To set apart or cut off from others.
Something that has been isolated.