WordWeb Online

1. Of or relating to or consisting of muscle
   "muscular contraction";
   - muscly
    
2. (of a person) possessing physical strength and weight; rugged and powerful
   "a muscular boxer";
   - brawny, hefty, powerful, sinewy, muscly
    
3. (anatomy) having a robust muscular body-build characterized by predominance of structures (bone and muscle and connective tissue) developed from the embryonic mesodermal layer
   - mesomorphic
    
4. Having or suggesting great physical power or force
   "the muscular and passionate Fifth Symphony"

See also: athletic, powerful, strong

Antonym: ectomorphic, endomorphic

Encyclopedia: Muscular