jellyfish(redirected from Purple Sail)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Marine coelenterates (class Hydrozoa) including some poisonous species, notably Physalia, the Portuguese man-of-war; toxin is injected into the skin by nematocysts on the tentacles, causing linear wheals.
Synonym(s): jelly (2)
n. pl. jellyfish or jelly·fishes
a. 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. Also called true jellyfish.
b. Any of various similar or related cnidarians.
Marine coelenterates, including some poisonous species; toxin is injected into the skin by nematocysts on the tentacles, causing linear wheals.
- any large medusa of the class Scyphozoa.
- the medusoid stages of any coelenterate.