| 释义 |
opei·do·scope
\ōˈpīdəˌskōp\ noun
Etymology: Greek opa (accusative) voice + eidos form + English -scope — more at voice, idol
: an instrument consisting essentially of a tube across one end of which is stretched a thin flexible membrane bearing a small mirror and used for exhibiting upon a screen by rays reflected from the mirror vibratory motions caused by sounds |