transcription, транскрипция: [ ˈüp-sə-ˌlän, ˈyüp-, ˈəp-, -lən, Britain usually ]
yüp-ˈsī-lən 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
1. : the 20th letter of the Greek alphabet — see alphabet table
2. : 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