Search Result for "tailback": 
Wordnet 3.0

NOUN (2)

1. (American football) the person who plays tailback;

2. (American football) the position of the offensive back on a football team who lines up farthest from the line of scrimmage; 



WordNet (r) 3.0 (2006):

tailback
    n 1: (American football) the person who plays tailback
    2: (American football) the position of the offensive back on a
       football team who lines up farthest from the line of
       scrimmage