- back-plane
- back-propagation
- back-run
- back-scrolling
- back-set
- back-shore
- back-slang
- back-slap
- back-streaming
- back-talk
- back-voltage
- backache
- backband
- backbit
- backbite
- backbiter
- backbiting
- backbitten
- backboard
- backbone
- backbone chassis
- backbone circuit
- backbone network
- backbone ring
- backbone road
- backbone site
- backcoating
- backcomb
- backcross
- backcut
- backdate
- backdating
- backdigger
- backdive
- backdrop
- backed bill
- backed ham
- backed note
- backed saw
- backed-off
- backer
- backfall
- backfile
- backfill
- backfill compactor
- backfill material
- backfill soil
- backfiller
- backfillet
- backfilling
- backfilling soil
- backfire
- backfire antenna
- backflash
- backflow
- backflow connection
- backflush accounting
- backflushing
- backgammon
- background
- background absorption
- background activity
- background area
- background art
- background blur
- background brightness
- background color
- background communication
- background concentration
- background data
- background display
- background document
- background emission
- background heater
- background heating
- background illumination
- background image
- background information
- background ink
- background job
- background level
- background light
- background mode
- background music
- background noise
- background operation
- background partition
- background picture
- background pollution
- background printing
- background process
- background processing
- background program
- background queries
- background radiation
- background reader
- background reflectance
- background region
- background return
- background save