preselector means any of various radio switching or filtering devices. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From pre- + selector.
noun
- Any of various radio switching or filtering devices.
- A manual gearbox designed so that the manual shift lever preselects the next gear to be used and a separate pedal is used to engage it, without needing to work a manual clutch.