The speed of light viewed as an uncrossable barrier to acceleration from subluminal and superluminal speeds in special relativity.

plural of barrier board

plural of barrier method

sound barrier

A bar or pole that can be lowered to block vehicular access through a controlled location, or raised to allow traffic to pass.

(video games) A (usually invisible) plane that causes the player character to die if touched or passed through.

An island close to, and parallel to, the main coastline.

a barrier to trade between countries in the form of high taxes or duties which may be imposed by a government.

(pathology, zoology) The inability of a disease to be transmitted from one species to a different one.

plural of barrier rogue