Толковый словарь английского языка - upsilon
Upsilon
upsilon
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
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1.
n. the twelfth letter of the Greek alphabet. Etymology: Gk, = slender U f. psilos slender, with ref. to its later coincidence in sound with Gk oi ...Толковый словарь английского языка Oxford English Reference
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