Definition of perizonium in US English:

perizonium

noun

  • The wall of an auxospore of a diatom.

Origin

Late 19th century; earliest use found in Henry Garnsey (1826–1903). From German Perizonium from peri- + ancient Greek ζώνη girdle, belt + German -ium.

Pronunciation

perizonium

/ˌpɛrɪˈzəʊnɪəm/