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|The Simple English Wiktionary has a definition for: barrier.|
Barrier may refer to:
- Breakwater, a barrier on a coast to protect a harbour from ocean currents and waves
- Defensive wall, built to protect against an attack
- Blood–brain barrier, a separation of circulating blood and the brain extracellular fluid
- Barrier reef, a type of coral reef running along a coast
| This disambiguation page lists articles associated with the title Barrier.
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