Any fish with fan-shaped fins or a distinctive fan-like appearance or fin structure.
From fan (noun) plus fish (Old English fisc), a direct compound describing the shape or fin characteristics of certain fish species.
Fish names often describe what they look like—fanfish sounds simple, but it actually describes an entire group of fish whose fins spread like folded fans when they swim or defend territory.
Complete word intelligence in one call. Free tier — 50 lookups/day.