racket wheel
/ˈrakɪt ˌwiːl/Now rare
noun
= ratchet wheel.
Origin
Mid 18th century; earliest use found in William Emerson (1701–1782), mathematician. Variant or alteration of ratchet wheel, perhaps after rack.
| 单词 | racket wheel |
| 释义 | racket wheel/ˈrakɪt ˌwiːl/Now rare noun = ratchet wheel. Origin |
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