n. 1 bearing in which the two halves are separated by a ring of small balls. 2 one of these balls. ballboy n. (fem. ballgirl) (in tennis) boy or girl who retrieves balls.
n. 1 bearing in which the two halves are separated by a ring of small balls. 2 one of these balls. ballboy n. (fem. ballgirl) (in tennis) boy or girl who retrieves balls.