playball

From play +‎ ball.

• (Received Pronunciation) IPA^(key): /ˈpleɪˌbɔːl/
• (General American) IPA^(key): /ˈpleɪˌbɔl/
• (cot–caught merger) IPA^(key): /ˈpleɪˌbɑl/

playball (plural playballs)

1. A ball for use in games.
   • 1909, Jack London, The Shrinkage of the Planet:

     What a play-ball has this planet of ours become!

   • 1971, Official Gazette of the United States Patent Office: Patents:

     A playball comprising a blend of rubber and a thermoplastic homopolymer of a styrene or substituted styrene […]

playball m (uncountable)

1. (baseball) the shout of "play ball!" said to start a baseball game