Definition of knuckleball
: a slow baseball pitch that moves erratically and unpredictably and that is thrown with little spin by gripping the ball with the knuckles or the tips of the fingers pressed against the top
From the M-W Editors
1907
First Known Use of knuckleball
1907
KNUCKLEBALL Defined for English Language Learners
knuckleball
playDefinition of knuckleball for English Language Learners
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baseball : a pitch that is thrown with very little spin by holding the ball with the knuckles or fingertips
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See words that rhyme with knuckleball Britannica.com: Encyclopedia article about knuckleball
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