Definition of zoantharian
: any of a subclass (Hexacorallia syn. Zoantharia) of anthozoans having tentacles or septa or both that are typically six or a multiple of six in number and including most of the recent corals and sea anemones
Origin of zoantharian
ultimately from zo- + Greek anthos flower — more at anthology
First Known Use: 1887
Seen and Heard
What made you want to look up zoantharian? Please tell us where you read or heard it (including the quote, if possible).