Definition of air-breathing in US English:

air-breathing

adjective

  • 1Designating an animal that breathes air. Often contrasted with water-breathing.

  • 2Designating or having a jet engine requiring the intake of air for the combustion of its fuel.

Origin

Late 18th century; earliest use found in Erasmus Darwin (1731–1802), physician and natural philosopher. From air + breathing.

Pronunciation

air-breathing

/ˈɛːˌbriːðɪŋ/