black

Unlike most roots on this site, black is not Latin or Greek — it is native Germanic, from Old English blæc ('black, dark, ink'), going back to Proto-Germanic *blakaz. It is one of the oldest, plainest words in English, and that is exactly why it builds compounds so freely: you just stick 'black' in front of another everyday word.

Most black- compounds are perfectly transparent — they name something by its dark color:

- black + board → blackboard: a dark surface you write on with white chalk.
- black + smith → blacksmith: a smith who works 'black metal' (iron), as opposed to a whitesmith who worked tin. The iron and the soot of the forge are both black.

But black also carries a heavy cloud of meaning: darkness, secrecy, the illicit, the sinister. A second group of compounds leans on that shadow side, and here the literal color often disappears:

- black + mail → blackmail: nothing to do with the post. 'Mail' here is an old Scots word māl meaning 'rent' or 'tribute.' Highland chiefs once demanded 'black rent' — protection money — from farmers. The 'black' marked it as illegitimate, sinister payment, versus honest 'white rent' paid in silver. The extortion meaning stuck.
- black + ball → blackball: in old gentlemen's clubs, members voted on new applicants by dropping balls into a box — a white ball to admit, a black ball to reject. Enough black balls and you were 'blackballed' — secretly rejected and excluded.

So the family splits into two moods. The plain compounds (blackboard, blacksmith) just describe color. The dark compounds (blackmail, blackball, and cousins like blacklist, black market) use 'black' as a flag for the hidden, the forbidden, the punishing. Same little word, two very different jobs.