Wordnet 3.0
ADJECTIVE (1)
1. 
 of a game (or the pitching) in which a pitcher allows the opponent no hits; 
- Example: "a no-hit pitcher"- Example: "a no-hit game"
The Collaborative International Dictionary of English v.0.48:
no-hit \no-hit\ (Baseball) adj.
   1. (Baseball) having no hits; characterized by one team
      scoring no hits; -- of a baseball game (or the pitching)
      in which a pitcher allows the opponent no hits; as, he
      pitched no-hit ball for seven innings. A no-hit game is
      usually referred to as a no-hitter; as, His no-hit
      pitching.
   Syn: hitless.
        [WordNet 1.5 --+PJC
WordNet (r) 3.0 (2006):
no-hit
    adj 1: of a game (or the pitching) in which a pitcher allows the
           opponent no hits; "a no-hit pitcher"; "a no-hit game"