hydranth
noun
hy·dranth ˈhī-ˌdran(t)th 
: one of the feeding zooids of a hydroid colony
Word History
Etymology
New Latin Hydra hydra + Greek ánthos "flower" — more at antho-
Note: The word was probably introduced by the Irish-born biologist George James Allman (1812-98) in A Monograph of the Gymnoblastic or Tubularian Hydroids (London, 1871), p. xiv.
First Known Use
1874, in the meaning defined above