Search Result for "empedocles": 
Wordnet 3.0

NOUN (1)

1. Greek philosopher who taught that all matter is composed of particles of fire and water and air and earth (fifth century BC); 



WordNet (r) 3.0 (2006):

Empedocles
    n 1: Greek philosopher who taught that all matter is composed of
         particles of fire and water and air and earth (fifth
         century BC)