Wordnet 3.0
NOUN (1)
1. 
 Japanese mathematical physicist who proposed that nuclear forces are mediated by massive particles called mesons which are analogous to the photon in mediating electromagnetic forces (1907-1981); 
[syn: Yukawa, Hideki Yukawa]
WordNet (r) 3.0 (2006):
Hideki Yukawa
    n 1: Japanese mathematical physicist who proposed that nuclear
         forces are mediated by massive particles called mesons
         which are analogous to the photon in mediating
         electromagnetic forces (1907-1981) [syn: Yukawa, Hideki
         Yukawa]