(informal, idiomatic) Raw petroleum; crude oil. / Black pepper, in the context of being a historically valuable spice.

plural of black rat

(US, southern) A geographic region where the residents are predominantly or exclusively African-American.

(martial arts) The highest belt colour in various martial arts. / (martial arts) Someone who has attained the black belt in martial arts. / (figuratively, colloquial) Great skill in any field.

An eye which has been bruised showing noticeable hematoma, especially after receiving a blow. / (figuratively) A defeat. / (figuratively) Damage to a reputation.

(physics) Alternative form of blackbody / Used other than figuratively or idiomatically: see black, body.

(idiomatic) Explicitly, in writing, clearly and without doubt or misunderstanding, without any grey areas. / (literally) Using shades of gray rather than color.

(intransitive) To participate in a black market. / (transitive) To sell in a black market.

Traded on the black market. / Contraband, bootleg or smuggled.

A penalty card issued by an official in several sports for infractions. / (fencing) The most severe of penalties, which results in the fencer being expelled from the match.