A barrier constructed across a road, especially as a military defence
An obstacle, barrier, or bulwark.
A place of confrontation.
to close or block a road etc., using a barricade
to keep someone in (or out), using a blockade, especially ships in a port
A fortified strip or boundary usually protecting a military position.
The outer limits of an area. See synonyms at circumference.
An instrument for determining the extent and shape of the field of vision.
The length of such a boundary.
The sum of the distance of all the lengths of the sides of an object.