noun
EXAMPLES FROM CORPUS
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A beach ball fell from the overhead luggage-tray.
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Arthur Smith, once a slender man, now was slender still except for the beach ball he sported under his shirt.
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Eventually that contest was supplanted by a wonderfully violent game played in the same small space, but with a beach ball .
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Place the beach ball on to your left leg inner thigh and raise you leg.
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Prop yourself up on your elbows and place a beach ball between your knees.
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Sitting crossed legged place the beach ball between your elbows at shoulder level and squeeze 20 times. 9.
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Well, the example reminds me distinctly of a beach ball seen end-on.