Meaning of aerocyst in English:

aerocyst

Pronunciation /ˈɛːrə(ʊ)sɪst/

noun

rare Botany
  • An air bladder of a seaweed.

Origin

Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From aero- + cyst, after French aérocyste.