1. acanthodian - Noun
2. acanthodian - Adjective
acanthodian (plural acanthodians)
(zoology) A member of a group of extinct fish (Acanthodii) that existed from the Silurian to the Permian period.[First attested in the mid 19th century.]
acanthodian (not comparable)
Pertaining to Acanthodii.[First attested in the mid 19th century.]