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Definitions

barrier

[bar-ee-er] / ˈbær i ər /




Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

To investigate further, researchers focused on glucosamine because it is a naturally occurring sugar-related molecule that can cross the blood-brain barrier.

From Science Daily • Jun. 10, 2026

I had a late start, and by the time I reached the fence, the ball bounced off my glove and over the barrier for a grand-slam home run.

From The Wall Street Journal • Jun. 9, 2026

This can lead to "retinol burn" where their protective skin barrier gets damaged.

From BBC • Jun. 6, 2026

The drug industry has been trying for years to develop tricks to shuttle the drugs that treat Alzheimer’s disease through the body’s protective brain-blood barrier, which blocks 99% of a dose from reaching the brain.

From Barron's • Jun. 4, 2026

Someone had put down a thick barrier of salt just inside the door.

From "Ophie's Ghosts" by Justina Ireland




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