Very dark; without light.

The plant Ballota nigra possessing a disagreeable odor. Traditionally used as a medicinal herb as an antispasmodic, stimulant and vermifuge.

Tea leaves which have been "fermented" (actually, oxidized) before drying to enhance their flavour (cf. green tea). / (Britain) A cup of tea served without milk.

Coal-black; the blackest black.

Pitch-black; of the blackest black.

Coffee served as a beverage without cream or milk.

(chemistry) The least reactive of the allotropes of phosphorus; it has no significant commercial use.

A Friday falling on the 13th day of the month (and therefore doubly ill-omened). / (possibly obsolete) Good Friday. / Any Friday actually darkened by catastrophe, or the anniversary thereof.

A species of truffle, Tuber melanosporum, darker than the white truffle, most commonly from France but also found in other parts of Europe, that is prized as a culinary ingredient.

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