. (Aëronautics) An aëroplane with a boatlike or other understructure that enables it to travel on, or to rise from the surface of, a body of water by its own motive power; -- now usually referred to as a seaplane. [ obsolescent ] [ Webster 1913 Suppl. +PJC ]
‖n. pl. [ NL., fr. Gr. "y`dwr water + &unr_; gills.] (Zool.) An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera. -- Hy`dro*bran"chi*ate a. [ 1913 Webster ]
a. [ Hydro-, 2 + bromic. ] (Chem.) Composed of hydrogen and bromine; as, hydrobromic acid. [ 1913 Webster ]
Hydrobromic acid (Chem.), a colorless, pungent, corrosive gas, HBr, usually collected as a solution in water. It resembles hydrochloric acid, but is weaker and less stable. Called also hydrogen bromide. [ 1913 Webster ]
n. (Chem.) A compound of hydrobromic acid with a base; -- distinguished from a bromide, in which only the bromine unites with the base. [ 1913 Webster ]
n. [ Hydro-, 2 + carbon. ] (Chem.) A compound containing only hydrogen and carbon, as methane, benzene, etc.; also, by extension, any of their derivatives. [ 1913 Webster ]
Hydrocarbon burner, furnace, stove, a burner, furnace, or stove with which liquid fuel, as petroleum, is used. [ 1913 Webster ]
(n) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological, Syn.hydrocephaly
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