*droid*

{ ‖ } n. [ Gr. 'androeidh`s of man's form; 'anh`r, 'andro`s, man + e'i^dos form. ] A machine or automaton in the form of a human being. [ 1913 Webster ]

a. [ Gr. cho`ndros cartilage + -oid. ] Resembling cartilage. [ 1913 Webster ]

n. [ Gr. ky`lindros cylinder + -oid: cf. F. cylindroïde. ] 1. A solid body resembling a right cylinder, but having the bases or ends elliptical. [ 1913 Webster ]

2. (Geom.) A certain surface of the third degree, described by a moving straight line; -- used to illustrate the motions of a rigid body and also the forces acting on the body. [ 1913 Webster ]

{ } a. [ Gr. &unr_; treelike; de`ndron tree + e'i^dos form: cf. F. dendroïde. ] Resembling a shrub or tree in form; treelike; branching.
Syn. -- arboreal, arboreous, arborescent, arboresque, arboriform, dendriform, treelike, tree-shaped. [ 1913 Webster ]

a. [ Hydra + -oid. ] (Zool.) Related to, or resembling, the hydra; of or pertaining to the Hydroidea. -- n. One of the Hydroideas. [ 1913 Webster ]

‖ n. pl. [ NL. See Hydra, and -oid. ] (Zool.) An extensive order of Hydrozoa or Acalephæ. [ Written also Hydroida. ] [ 1913 Webster ]

☞ 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. [ 1913 Webster ]

a. (Paleon.) Allied to, or resembling, Lepidodendron. -- n. A lepidodendrid. [ 1913 Webster ]

a. [ Salamander + -oid. ] (Zool.) Like or pertaining to the salamanders. [ 1913 Webster ]