Jellyfish definitions

Any of various free-swimming, mostly marine cnidarians (esp. class Scyphozoa) with a body made up largely of jellylike substance and shaped like an umbrella: it has long, hanging tentacles with stinging cells on them.

A weak-willed person.

Any of numerous usually free-swimming marine cnidarians of the class Scyphozoa, characteristically having a gelatinous, tentacled, often bell-shaped medusa stage as the dominant phase of its life cycle.

Any of various similar or related cnidarians.

One who lacks force of character; a weakling.

Any of numerous usually free-swimming marine cnidarians of the class Scyphozoa, characteristically having a gelatinous, tentacled, often bell-shaped medusa stage as the dominant phase of its life cycle.

Any of various similar or related cnidarians.