Jellyfish (noun)

1. A marine invertebrate of the phylum Cnidaria, typically having a bell-shaped body and long, trailing tentacles.
2. A translucent, gelatinous creature that lives in saltwater and has a bell-shaped body and long, stinging tentacles.

Origin:

The word jellyfish is a compound word formed from "jelly" and "fish" which was first used in the early 18th century.

Examples:

1. We saw a jellyfish while snorkeling.
2. The jellyfish pulsated as it drifted through the water.
3. The jellyfish's venomous tentacles can cause a painful sting.
4. The jellyfish was drifting aimlessly in the current.
5. Jellyfish are found in all oceans of the world.