dirac dir-login • dirca · · · Info · Definitions · Characters · · dirac · · Text Latin · · Script 5 · · Length 2 · · Syllables Definitions · · · (noun) English theoretical physicist who applied relativity theory to quantum mechanics and predicted the existence of antimatter and the positron (1902-1984). Synonyms: Dirac, Paul Adrien Maurice Dirac. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 i latin small letter i U+0069 r latin small letter r U+0072