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Từ điển American Heritage Dictionary 4th
barrier
bar·ri·er (bărʹē-ər)n. 1. A structure, such as a fence, built to bar passage. 2. Something immaterial that obstructs or impedes: Intolerance is a barrier to understanding. See Synonyms at obstacle. 3. Physiology. A membrane, tissue, or mechanism that blocks the passage of certain substances. 4. Ecology. A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations. 5. A boundary or limit. 6. Something that separates or holds apart. 7. A movable gate that keeps racehorses in line before the start of a race. 8. The palisades or fences enclosing the lists of a medieval tournament. Often used in the plural. 9. Geology. An ice barrier. [Middle English barrer, from Old French barriere, from Vulgar Latin *barrāria, from *barra, bar.]
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