Wordnet 3.0
NOUN (1)
1.
(baseball) the area over home plate between a batter's knees and shoulders through which a pitch must pass in order to be called a strike;
The Collaborative International Dictionary of English v.0.48:
Strike zone \Strike" zone\, n. (Baseball)
the area above home plate where, if a pitched ball passes
through and is not hit by the batter, the pitch counts as a
strike. Specifically, it is directly above home plate and at
a height from the knees to the shoulders of the batter.
[PJC]
WordNet (r) 3.0 (2006):
strike zone
n 1: (baseball) the area over home plate between a batter's
knees and shoulders through which a pitch must pass in
order to be called a strike