sidewall

plural sidewalls

1. The side of a tire.

   If the puncture had been in the tread I could have had the tire patched, but it was in the sidewall and they can't fix that: they have to replace the whole tire.

2. The wall forming the side of a structure; a side wall.
   1. The wall forming the side of a racquetball court.

      The kill shot may also be used against balls weakly played off the sidewall

      1978, Charles Garfinkel, Racquetball the easy way, page 87

      2 more examples

      Mark flipped the ball to Jon for service. His high serve drifted perfectly down the left-hand court, and Mark's weakly hit return fell short off the sidewall.

      2003, David Waters, February the Sixth, page 53

      Further, the grazing blow caused the ball to pick up a furiously wicked spin, making it a madly twirling object. The ball skimmed off the sidewall near the corner and into the lower-right corner of the front wall.

      2009, Allan D. Moore, Doms Need Love Too!: Adventures of the Day Old Muffins, page 116