A dark board, usually black or green, on which you write with chalk, commonly used in classrooms for teaching.
Compound word: 'chalk' from Old English 'cealc' (via Latin 'calx') meaning limestone, and 'board' from Old English 'bord.' Combined in the 1600s as classrooms became common.
Chalkboards were so revolutionary that they literally changed education—before them, information had to be written on paper one copy at a time for each student!
Complete word intelligence in one call. Free tier — 50 lookups/day.