cnidarian
Concise Oxford English Dictionary © 2008 Oxford University Press:
cnidarian /(k)nʌɪˈdɛːrɪən/ Zoology
▶noun an aquatic invertebrate animal of the phylum Cnidaria, which comprises the coelenterates. ▶adjective relating to cnidarians.
– origin from mod. L. Cnidaria, from Gk knidē ‘nettle’.
'cnidarian' also found in these Oxford entries:

