UPSILON


Meaning of UPSILON in English

noun Etymology: Middle Greek y psilon, literally, simple y; from the desire to distinguish it from oi, which was pronounced the same in later Greek Date: 1621 the 20th letter of the Greek alphabet, any of a group of unstable electrically neutral elementary particles of the meson family that have a mass about 10 times that of a proton

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.