barricade

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A structure set up across a route of access to obstruct the passage of an enemy.
2. n. Something that serves as an obstacle; a barrier. See Synonyms at bulwark.
3. v. To close off or block with a barricade.
4. v. To keep in or out by means of a barricade.

Century Dictionary and Cyclopedia

1. n. A hastily made fortification of trees, earth, paving-stones, palisades, wagons, or anything that can obstruct the progress of an enemy or serve for defense or security.
2. n. A temporary barrier of any kind designed to obstruct passage into or through a space intended to be kept free for a particular use.
3. n. Any bar or obstruction; that which defends.
4. n. In naval architecture, a strong wooden rail, supported by stanchions, extending across the foremost part of the quarter-deck, in ships of war, and backed with ropes, mats, pieces of old cable, and full hammocks, as a protection against small shot in time of action. Synonyms Bar, etc. See barrier.
5. To obstruct or block (a path or passage) with a barricade.
6. To block or render impassable.
7. To shut in and defend with a barricade; hem in.
8. Also formerly barricado.

Wiktionary

1. n. A barrier constructed across a road, especially as a military defence
2. n. An obstacle, barrier, or bulwark.
3. n. figuratively, in the plural A place of confrontation.
4. v. to close or block a road etc., using a barricade
5. v. to keep someone in (or out), using a blockade, especially ships in a port

GNU Webster's 1913

1. n. (Mil.) A fortification, made in haste, of trees, earth, palisades, wagons, or anything that will obstruct the progress or attack of an enemy. It is usually an obstruction formed in streets to block an enemy's access.
2. n. Any bar, obstruction, or means of defense.
3. v. To fortify or close with a barricade or with barricades; to stop up, as a passage; to obstruct.

WordNet 3.0

1. v. block off with barricades
2. n. a barrier (usually thrown up hastily) to impede the advance of an enemy
3. n. a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.
4. v. prevent access to by barricading
5. v. render unsuitable for passage