any of the coelenterates of the former taxonomic group Acalephae, which included the jellyfishes
Word origin
C18: from New Latin, from Greek akalēphē a sting
acaleph in American English
(ˈækəˌlɛf)
noun
Obsolete
any of several invertebrate animals, as jellyfish, that swim or float about in the open sea; coelenterate or ctenophore (former class Acalephes, phylum Zoophyta)