Transitive verb meaning ‘to obstruct with a barrier’ or ‘to surround with a barrier’. Fairly uncommon but attested (e.g. “The road was barriered off”).

barrieradjective

Attributive use of the noun in compound phrases (barrier cream, barrier method) functioning adjectivally.

Definitions

barriernoun

A structure or object that impedes or prevents passage.

The construction crew set up a barrier to keep pedestrians away from the work site.

A circumstance or obstacle that keeps people or things apart or prevents communication or progress.

Language can be a significant barrier to effective communication between different cultures.

A physical or metaphorical boundary or limit.

The new policy aims to break down barriers to entry for small businesses.

In physiology or biology, a membrane, layer of tissue, or other natural defense that prevents or restricts the passage of substances.

The blood–brain barrier prevents many drugs from entering the brain.

barrierverb

To erect or place a barrier across or around; to obstruct with a barrier.

After the rockslide, workers barriered the trail to keep hikers away.

barrieradjective

Serving to block, protect, or act as a barrier against something.

Apply a barrier cream to protect the skin from chemicals.