noun
polka-dot ribbonfish
A deep-sea ribbonfish with a distinctive polka-dot pattern; the name comes from its long, flowing fins resembling furisode sleeves.
フリソデウオは深海魚で、銀色の体に黒い斑点がある。
The polka-dot ribbonfish is a deep-sea fish with a silver body and black spots.
From 振袖 (furisode, 'long-sleeved kimono') + 魚 (uo, 'fish'), referring to the fish's long, flowing fins.