ceras
/ˈsɪrəs/
noun
- A fleshy, finger-like projection on the back of certain sea slugs (nudibranchs) used for breathing and defense.
- Each ceras on the nudibranch contains stinging cells for protection.
- The sea slug extended its ceras to absorb oxygen from the water.
- Divers often photograph the bright colors of the ceras on these marine animals.