paraphonia /par-ə-fōˈni-ə/

1. (in Byzantine music) a melodic progression by fourths and fifths
2. A morbid change of voice
3. An alteration of the voice, as at puberty

• back-load
• back-loaded
• back-loading
• back-loads
• backlog
• backlogs
• backlot
• backlots
• backmarker
• backmarkers
• backmost
• back-mutation
• back-mutations
• back number
• back numbers
• back of
• back off
• back-office
• back-of-the-envelope
• back on one's heels
• back out
• backpack
• backpacked
• backpacker
• backpackers