Definition of jellyfish Jellyfish

/ʤɛˈlifɪˌʃ/ - [jeleefish] - jel•ly•fish

We found 7 definitions of jellyfish from 6 different sources.

What does jellyfish mean?

Noun Plural: jellyfishes
jellyfish - any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
		cnidarian, coelenterate radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms
		cnidaria, coelenterata, phylum cnidaria, phylum coelenterata hydras; polyps; jellyfishes; sea anemones; corals
		aegina small medusa
jellyfish - large siphonophore having a bladderlike float and stinging tentacles
		Portuguese man-of-war, man-of-war
		siphonophore a floating or swimming oceanic colony of polyps often transparent or showily colored

= synonym
= antonym
= related word

jellyfish (Noun)
Almost transparent aquatic being; any one of the acalephs, especially one of the larger species, having a jellylike appearance.

jellyfish (n.)
Any one of the acalephs, esp. one of the larger species, having a jellylike appearance. See Medusa.

jellyfish
A marine animal of the subphylum Medusozoa consisting of a gelatinous umbrella-shaped bell and trailing tentacles.

Jellyfish are water-living animals.

Their bodies consist of 99% water and they have no bones or inner organs. A jellyfish has a bell-shaped body and long tentacles at the underside of the body. (Tentacles are long "arms" with special stinging cells.) They move by contracting moves of their bell, but they cannot decide where to go on their own. Most time they drift with the water current.

This is why they assemble in swarms. They reproduce without mating by creating polyps, which do not look like jellyfish and are fixed to the ground.

When they turn to 10-15 small jellyfish, they die.

Jellyfish eat plankton and little fish, which are caught by their poisoned tentacles.

Some jellyfish live in symbiosis with algae. The jellyfish transport them into sunlight and get the nutrients (of their photosynthesis) from them. The largest species is the Portuguese Man o' War.