tennis ball

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Also see: ball

Concise Oxford English Dictionary © 2008 Oxford University Press:
tennis/ˈtenɪs/

▶noun a game in which two or four players strike a hollow rubber ball with rackets over a net stretched across a grass or clay court. See also real tennis.

– origin ME tenetz, tenes ‘real tennis’, appar. from OFr. tenez ‘take, receive’ (called by the server to an opponent), imper. of tenir.