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ball (1)
ball (2)
ball and chain
ball-and-claw
ball and socket joint
ball bearing
ball boy
ball carrier
ball clay
ball cock
ball field
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ball clay

ball clay


noun 
Definition:
 
clay used in ceramics: a sedimentary clay containing kaolin, mica, other minerals, and organic matter. Use: ceramics.

[< an obsolete mining process in which clay was handled as rounded cubes ("balls")]
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