(băr′ē-ĕr)
[Pronunciation]
[O. Fr. barriere]

1. An obstacle, impediment, obstruction, boundary, or separation.
2. A device (e.g., a glove, mask, or drape) used to limit potentially infectious contact between health care providers and patients.

Subentries:
architectural barrier
blood-brain barrier
chemical barriers
placental barrier
primary radiation barrier
secondary radiation barrier