(also disk especially in NAmE ) / dɪsk; NAmE / noun
1.
a thin flat round object :
He wears an identity disc around his neck.
2.
= CD :
This recording is available on disc or cassette.
3.
( BrE ) a disk for a computer
4.
( old-fashioned ) = record (2)
5.
a structure made of cartilage between the bones of the back :
He's been off work with a slipped disc (= one that has moved from its correct position, causing pain) .
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WORD ORIGIN
mid 17th cent. (originally referring to the seemingly flat circular form of the sun or moon): from French disque or Latin discus from Greek diskos .