snowfall (n.)youdaoicibaDictYouDict[snowfall 词源字典]
1821, "fall of snow," especially a quiet one (as distinguished from a snowstorm), from snow (n.) + storm (n.). From 1875 as "amount that falls at a place in a given time."[snowfall etymology, snowfall origin, 英语词源]
nonagesimalyoudaoicibaDictYouDict
" Astronomy and Astrology . The point of the ecliptic which is highest above the horizon at any given time, being 90 degrees round the ecliptic from the point at which it intersects the horizon", Early 18th cent.; earliest use found in John Harris (c1666–1719), writer and lecturer on science. From classical Latin nōnāgēsimus ninetieth (from nōnāgintā ninety (from novem nine + -gintā, suffix forming cardinal numerals from thirty to ninety, related to decem ten: see decem-) + -ēsimus, extended form (after vīcēsimus) of -simus, suffix used to form ordinal numerals) + -al.