/ ˈmɑːbl; NAmE ˈmɑːrbl/ noun
1.
[ U ] a type of hard stone that is usually white and often has coloured lines in it. It can be polished and is used in building and for making statues, etc. :
a slab / block of marble
a marble floor / sculpture
2.
[ C ] a small ball of coloured glass that children roll along the ground in a game
3.
marbles [ U ] a game played with marbles :
Three boys were playing marbles.
4.
marbles [ pl. ] ( informal ) a way of referring to sb's intelligence or mental ability :
He's losing his marbles (= he's not behaving in a sensible way) .
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WORD ORIGIN
Middle English : via Old French (variant of marbre ), from Latin marmor , from Greek marmaros shining stone, associated with marmairein to shine.