A safety feature of auto racing venues, consisting of stacked tires secured together, that provides a cushion in the event of an impact.

A means of contraception involving an impenetrable barrier, such as a diaphragm or condom, between sexual partners.

Synonym of tollbar

a part of the Antarctic ice shelf that extends into the sea

A thin layer (usually micrometres thick) of metal usually placed between two other metals. It is done to act as a barrier to protect either one of the metals from corrupting the other.

A conceptual barrier to effective communication, occurring when people who speak different languages attempt to communicate with each other.

A barrier, such as a fence or pole, used to separate the participants in a joust.

(uncountable) Sonic barrier, the sudden increase in drag (resistance) and other effects experienced by moving objects when their speed approaches that of sound or becomes supersonic (which used to be considered a barrier to higher speeds).

(physics) the barrier between two atomic nuclei, due to Coulomb repulsion, that has to be overcome for nuclear fusion to proceed

A reef separated from the adjacent coast by a channel or lagoon.