whizzer
Noun
Meaning
A set of horizontal blades used to separate mineral particles.
A device used in milling to dry wheat, etc. by rapid spinning.
(UK, slang) A pickpocket.
(historical) Synonym of whizgig (“spinning toy”)
Source: en.wiktionary.orgSynonyms
Examples
Since the whizzer cone is smaller than the main diaphragm, output dispersion at high frequencies is improved relative to an equivalent single larger diaphragm.
The main cone in a whizzer design is manufactured so as to flex more in the outer diameter than in the center.
The result is that the main cone delivers low frequencies and the whizzer cone contributes most of the higher frequencies.