jellyfish

5 ENTRIES FOUND:

jel·ly·fish

noun \ˈje-lē-ˌfish\

: a sea animal that has a very soft body and that can sting

Full Definition of JELLYFISH

1
a :  a free-swimming marine coelenterate that is the sexually reproducing form of a hydrozoan or scyphozoan and has a nearly transparent saucer-shaped body and extensible marginal tentacles studded with stinging cells
b :  siphonophore
c :  ctenophore
2
:  a person lacking backbone or firmness

Examples of JELLYFISH

  1. <a jellyfish who was afraid to tell her boss that her latest brainstorm was just plain bad>

Illustration of JELLYFISH

First Known Use of JELLYFISH

1841

Related to JELLYFISH

jel·ly·fish

noun \ˈjel-ē-ˌfish\   (Medical Dictionary)

Medical Definition of JELLYFISH

: a free-swimming marine coelenterate that is the sexually reproducing form of a hydrozoan or scyphozoan and has a nearly transparent saucer-shaped body and extensible marginal tentacles studded with stinging cells

jellyfish

noun    (Concise Encyclopedia)

Life cycle of the common jellyfish Aurelia. Eggs released by females pass out through the …—© Merriam-Webster Inc.

Any of about 200 described species of free-swimming marine cnidarians (in the classes Scyphozoa and Cubozoa), many of which have a bell-shaped body. The term is also frequently applied to other similar cnidarians (e.g., Portuguese man-of-war) and some unrelated forms (e.g., ctenophores and salps). In scyphozoan jellyfish, the free-swimming medusa form is the dominant stage, with the sessile polyp form found only during larval development. Jellyfish live in all oceans and include the familiar disk-shaped animals that are often found drifting along the shoreline. Most species are 1–16 in. (2–40 cm) in diameter; some are 6 ft (1.8 m) in diameter, with tentacles more than 100 feet (30 m) long. Though some jellyfish simply filter-feed, most feed on small animals (e.g., crustaceans) that they catch in their tentacles, whose stinging cells immobilize the prey; contact can be irritating and sometimes dangerous to humans. The cubozoan jellyfish comprise 50 species of box jellies (the rather spherical body is squared off at the edges), which are usually 1–2 in. (2–4 cm) in diameter.

Browse

Next Word in the Dictionary: jelly fungus
Previous Word in the Dictionary: jelly end rot
All Words Near: jellyfish

Seen & Heard

What made you want to look up jellyfish? Please tell us where you read or heard it (including the quote, if possible).