Definition of octocorallian in US English:

octocorallian

noun

Zoology
  • A coral of the subclass Octocorallia, distinguished by having polyps with eight tentacles; an alcyonarian.

adjective

Zoology
  • Of, relating to, or designating corals of the subclass Octocorallia.

Origin

1930s; earliest use found in Science. From scientific Latin Octocorallia, subclass name + -an.

Pronunciation

octocorallian

/ˌɒktə(ʊ)kɒˈralɪən/