noun
sponge ball; soft ball
A ball made of sponge or soft material, often used in children's play, water games, or as a stress ball.
子供たちはプールでスポンジボールを投げ合って遊んだ。
The children played catch with a sponge ball in the pool.
Variant with a middle dot, sometimes used for clarity.
Loanword from English 'sponge ball'.