Meanings

backboard

carapace

breach of faith

backdrop (at the back of a stage)

background radiation

cosmic microwave background radiation

microwave background (radiation)

background briefing

dorsal stream

national citizen identification number system

dorsal

knuckle-walking (e.g. by chimpanzees, etc.)

dorsal thalamus

dorsal

back fat

cold wind descending from the mountains

to have a cross to bear

to turn one's back on

pygmy right whale (Caperea marginata)

Hector's dolphin (Cephalorhynchus hectori)