Yu·ka·wa 
(y-käwä), Hideki 1907-1981.
(y-käwä), Hideki 1907-1981. Japanese physicist. He won a 1949 Nobel Prize for predicting the existence of the meson based on theories concerning the strong force.
- protogyny
- protohistorian
- protohistoric
- protohistory
- protohuman
- Proto-Indo-European
- protolanguage
- protolithic
- protomartyr
- protomorph
- protomorphic
- proton
- protonema
- protonemal
- protonematal
- protonic
- protonotary
- protonotary
- protonotary apostolic
- proton-proton chain
- proton pump inhibitor
- proton synchrotron
- proto-oncogene
- protopathic
- protopathy