- belonging or pertaining to the order or suborder Actiniaria, comprising the sea anemones.
- any sea anemone.
Origin of actinian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for actinian
Moreover, there are some modern corals in which the secondary cycle of mesenteries departs from the Actinian plan.