echelette

/esh-uh-let, ey-shuh-/US // ˌɛʃ əˈlɛt, ˌeɪ ʃə- //

戊辰,戊戌年,戊辰年,戊戌变法

Definitions

n.名词 noun

1
Spectography.
- : a diffraction grating designed to reflect infrared radiation.