browse words by letter
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
hydroidea |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Hydroidea \Hy*droi"de*a\, n. pl [NL. See {Hydra}, and {-oid}.] (Zo["o]l.) An extensive order of Hydrozoa or Acaleph[ae]. [Written also {Hydroida}.] Note: This order includes the hydras and the free-swimming hydromedus[ae], together with a great variety of marine attached hydroids, many of which grow up into large elegantly branched forms, consisting of a vast number of zooids (hydranths, gonophores, etc.), united by hollow stems. All the zooids of a colony are produced from one primary zooid, by successive buddings. The Siphonophora have also been included in this order by some writers. See {Gymnoblastea}, {Hydromedusa}, {Gonosome}, {Gonotheca}.
This work is licensed under a
