Noun
1. (baseball) the slight elevation on which the pitcher stands
2. a small natural hill
3. a collection of objects laid on top of each other
4. structure consisting of an artificial heap or bank usually of earth or stones;
"they built small mounds to hide behind"5. the position on a baseball team of the player who throws the ball for a batter to try to hit;
"he has played every position except pitcher""they have a southpaw on the mound"