black-bean

The compound 'black-bean' is a transparent English formation, combining two ancient and fundamental words. 'Black' descends from the Old English adjective 'blæc,' which originally conveyed the concept of intense darkness or the color of soot. 'Bean' traces back to the Old English noun 'bēan,' a term for edible seeds that has cognates across Germanic languages and originates from a widespread Proto-Indo-European root. The logic of the compound is purely descriptive, directly naming the variety of bean by its most visually distinctive characteristic—its deep, dark color—a straightforward method of classification common in agricultural and culinary vocabulary.

Structure: black (color) + bean (seed) - black: From Old English blæc, meaning "dark, ink." It is a Germanic word of uncertain deeper origin, functioning here as an adjective describing color. - bean: From Old English bēan, meaning "bean, pea, legume." It is a common Germanic word, ultimately from a Proto-Indo-European root, functioning as the core noun.