English-Thai Dictionary
hydroid
A เกี่ยวกับ สัตว์ พวก Hydrozoa ที่ สืบ พัน ธู์ ด้วย การ แตกหน่อ
Webster's 1828 Dictionary
HYDROIDIC
a.[hydrogen and iodic. ] Denoting a peculiar acid or gaseous substance, produced by the combination of hydrogen and iodine.
Webster's 1913 Dictionary
HYDROID
Hy "droid, a. Etym: [Hydra + -oid.] (Zoöl.)
Defn: Related to, or resembling, the hydra; of or pertaining to the Hydroidea. -- n.
Defn: One of the Hydroideas.
HYDROIDEA
Hy *droi "de *a, n. pl. Etym: [NL. See Hydra, and -oid.] (Zoöl.)
Defn: An extensive order of Hydrozoa or Acalephæ. [Written also Hydroida.]
Note: This order includes the hydras and the free-swimming hydromedusæ, 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.
New American Oxford Dictionary
hydroid
hy droid |ˈhīˌdroid ˈhaɪdrɔɪd |Zoology ▶noun a coelenterate of an order that includes the hydras. They are distinguished by the dominance of the polyp phase. [Order Hydroida, class Hydrozoa. ] ▶adjective of or relating to coelenterates of this group. • another term for polypoid ( sense 1 ). ORIGIN mid 19th cent.: from hydra + -oid .
Oxford Dictionary
hydroid
hydroid |ˈhʌɪdrɔɪd |Zoology ▶noun a coelenterate of an order which includes the hydras. They are distinguished by the dominance of the polyp phase. ●Order Hydroida, class Hydrozoa. ▶adjective relating to coelenterates of the hydroid group. • another term for polypoid ( sense 1 ). ORIGIN mid 19th cent.: from hydra + -oid .
The Wordsmith Dictionary