Starfish (noun)

1. A star-shaped marine animal with five arms, often brightly colored and living on the seabed.
2. A star-shaped sea urchin with spiny arms.

Origin:

Early 17th century: from old english stǣr + fish.

Examples:

1. The starfish is a common sight on the rocky shores of the Pacific Ocean.
2. Some starfish are capable of regrowing lost limbs.
3. The starfish is a common predator of mussels and other mollusks.
4. A starfish's skin is covered in tiny spines for protection.
5. The starfish is a popular subject for marine biology research due to its interesting reproductive and feeding habits.