automatic locking - barren zone
- balas ruby
- balavinskite
- balcony
- bald
- bald mountain
- bald peak
- bald-headed
- bald-headed structure
- baldaufite
- baldite
- bale
- baleen whale
- balistite
- balk
- balk iron
- balk structure
- balka
- balkhashite
- balkstone
- ball
- ball and low
- ball check
- ball ice
- ball iron
- ball ironstone
- ball jointing
- ball load
- ball of green filaments
- ball of water
- ball porphyry
- ball pulverizer (tube) mill
- ball pyrite
- ball structure parting
- ball texture
- ball vein
- ball-and-socket joint
- ball-and-socket jointing
- ball-and-socket structure
- ball-bearing mill
- ball-casting machine