'Sea fan' definitions:
Definition of 'sea fan'
From: WordNet
noun
Corals having a treelike or fan-shaped horny skeleton
Definition of 'Sea fan'
From: GCIDE
- Sea fan \Sea" fan"\ (s[=e]" f[a^]n`). (Zool.) Any gorgonian which branches in a fanlike form, especially Gorgonia flabellum of Florida and the West Indies. [1913 Webster]