the GNU version of the Collaborative International Dictionary of English
n. A batted ball that hits the ground before it leaves the infield, or the act of hitting a baseball along the ground; also called ground ball; -- contrasted with fly or fly ball.
The Century Dictionary and Cyclopedia
n. In base-ball and similar games, a ball knocked or thrown along the ground and not rising into the air.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. (baseball) a hit that travels along the ground
Word Usage
"The crowd did that collectively when Richard fielded a routine grounder from the Twins 'Midre Cummings at first base with two outs in the first inning of the series finale and, attempting a forceout at second, threw the ball into left field."