köken: From Middle Dutch drope (“drop”), from Old Dutch dropo, from Proto-Germanic *drupô. When unsuffixed, drop is more common than drup, but suffixed druppel is more common than droppel; this is likely due to the effects of i-umlaut triggered by the suffix -el. Indeed, drup is assumed to be based on druppel, as drop is the linguistically expected form (Germanic *u becomes Dutch o). The sense…
köken: Inherited from Byzantine Greek χιόνι (khióni), from Koine Greek χιόνιον (khiónion), diminutive of Ancient Greek χιών (khiṓn, “snow”), from Proto-Hellenic *kʰiṓn, from Proto-Indo-European *ǵʰéyōm. Compare Mariupol Greek шон (šon).
köken: Compound of 小(こ) (ko-, “light, slight”) + 雨(さめ) (same, “rain”). The medial -s- may be epenthesis between the two vowels, or it may be cognate with Korean interfix -ᄉ- (-s-) used to mark possession, much like English 's. See also 春雨(はるさめ) (harusame, “spring rain”) and 稲(しね) (shine, “rice”).