Tsiolkovsky

Part of speech: noun

Definitions

1. A Russian pioneer who laid the theoretical foundations of rocketry and spaceflight ; a large crater on the Moon's far side named in honor of that scientist
2. The early Russian scientist whose theories shaped rocket science and space travel ; a big impact crater on the lunar far side that bears his name
3. A rocket theorist from Imperial Russia who proposed how humans could reach space ; a wide crater on the Moon's hidden side named for him

Etymology: Konstantin Tsiolkovsky was a self-taught Russian schoolteacher who spent decades working out the mathematics of spaceflight, and his surname became the name of a term used in rocketry and space studies. The word "tsiolkovsky" is the English form of the Russian Циолковский, which in turn comes from the Polish Ciołkowski, a surname of Polish origin carried by his family. Because the name passed through two languages before reaching English, its spelling shifts from "Ciołkowski" to the Russian "Ciolkovskij" and finally to the transliteration used in English. The word is a proper noun borrowed directly as a personal name, with no native English meaning of its own. Its use in English reflects the pioneering status of the man who bore it, much as other scientists' names become attached to units, equations or concepts in their fields.