Dictionary.com
Thesaurus.com

rhumbatron

British  
/ ˈrʌmbəˌtrɒn /

noun

  1. another name for cavity resonator

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of rhumbatron

C20: from rhumba + tron , from the rhythmic variation of the waves