blackboard

[blak-bawrd, -bohrd] /ˈblækˌbɔrd, -ˌboʊrd/

noun

a sheet of smooth, hard material, especially dark slate, used in schools, lecture rooms, etc., for writing or drawing on with chalk.

Also called chalkboard.

Compare greenboard.

Origin

1815-25; black + board

Examples from the web for blackboard

Writing the ideas on the blackboard may reinforce reading skills.
He argues that economists should abandon blackboard deduction in favour of computer simulation.
It has no desks, only a single blackboard and intermittent supplies of chalk.
And a projector is easier to move than a blackboard-sized screen.
Accept all answers as valid and place the word or words on overhead, blackboard or newsprint.

British Dictionary definitions for blackboard

/ˈblækˌbɔːd/

noun

a hard or rigid surface made of a smooth usually dark substance, used for writing or drawing on with chalk, esp in teaching

Word Origin and History for blackboard

1823, from black + board (n.1). Blackboard jungle "inner-city school rife with juvenile delinquency" is from Evan Hunter's novel title (1954).