NOUN (2)

1. a region of the United States comprising states bordering the Gulf of Mexico; Alabama and Florida and Louisiana and Mississippi and Texas;

2. the countries in southwestern Asia that border the Persian Gulf;

WordNet (r) 3.0 (2006):

Gulf States
    n 1: a region of the United States comprising states bordering
         the Gulf of Mexico; Alabama and Florida and Louisiana and
         Mississippi and Texas
    2: the countries in southwestern Asia that border the Persian
       Gulf