chalk·board 
(chôkbôrd′)
(chôkbôrd′)n.
A smooth hard panel, usually green or black, for writing on with chalk; a blackboard.
- Magna Carta
- Magna Charta
- magna cum laude
- Magna Graecia
- magnanimity
- magnanimous
- magnanimously
- magnanimousness
- magnate
- magnesia
- magnesian
- magnesite
- magnesium
- magnesium carbonate
- magnesium hydroxide
- magnesium oxide
- magnesium sulfate
- magnet
- magnet-
- magnet-
- magnetar
- magnetic
- magnetically
- magnetic bottle
- magnetic bubble memory