Mach
来自Big Physics
1930s: named after Ernst Mach (see Mach, Ernst).
wiktionary
From Czech Mach, Slovak Mach, Polish Mach and related languages, from pet forms produced by truncation of personal names beginning with Ma- and the addition of the Slavic suffix -ch. Less commonly, a respelling of Hungarian Mács. In some cases, from Vietnamese or Cambodian. [1]
etymonline
Mach
measure of speed relative to the speed of sound (technically Mach number), 1937, named in honor of Austrian physicist Ernst Mach (1838-1916).
