- any anthozoan coelenterate of the subclass Alcyonaria, as corals and sea anemones, having the tentacles and other body parts in branches or segments of eight.
- belonging or pertaining to the Alcyonaria.
Origin of alcyonarian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for alcyonarian
Every Alcyonarian colony is developed by budding from a single parent zooid.
In the Alcyonarian forms belonging to this great group these tentacles are always eight in number, and fringed on both sides.
More interesting than the Annelids, however, are the Alcyonarian Actinozoa.