disc
(also esp US disk), / dɪsk; dɪsk/ n
1 flat thin round plate, eg a coin 扁平的圆盘状物（如硬币）
2 small flat object of any shape 小的扁平物体
He wears an identity disc round his neck. 他脖子上挂著身分牌儿.
3 round surface that appears to be flat 似扁平的圆面: the moon's disc 月轮.
4 = record1 3: recordings on disc and cassette 唱片和盒式磁带上的录音.
5 (anatomy 解) layer of cartilage between the bones of the spine 椎骨间的软骨层; 椎间盘
a slipped disc, ie one that is slightly dislocated 突出的椎间盘（即轻微错位）.