piston whistle
noun
A whistle in which the pitch of the sound is varied by means of a piston sliding in the tube, shortening or lengthening the vibrating column of air.
Origin
Late 19th century; earliest use found in The Century Dictionary.
| 单词 | piston whistle |
| 释义 | piston whistlenoun A whistle in which the pitch of the sound is varied by means of a piston sliding in the tube, shortening or lengthening the vibrating column of air. Origin |
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