hydrocarˈbon noun

A compound of hydrogen and carbon with nothing else, occurring notably in oil, natural gas and coal

hydrochloric /-klorˈik or -klörˈ/ adjective

Applied to an acid composed of hydrogen and chlorine, hydrogen chloride, still sometimes called muriatic acid

hydrochlorˈide noun

A compound of hydrochloric acid with an organic base

hydrochlorofluorocarˈbon noun

A chlorofluorocarbon that contains hydrogen and is therefore more easily broken down

hydrocorˈtisone noun

One of the corticosteroids, 17-hydroxy-corticosterone, a synthesized form of which is used to treat rheumatoid arthritis, etc

hyˈdrocracking noun

Cracking of petroleum, etc in the presence of hydrogen

hydrocyanic /-sī-anˈik/ adjective

Denoting an acid (prussic acid) composed of hydrogen and cyanogen

hydroferricyanic /-fer-i-sī-anˈik/ and hydroferrōcyanˈic adjective

Applied to two acids composed of hydrogen, iron and cyanogen, hydroferricyanic acid, H₃Fe(CN)₆, having an atom of hydrogen less than hydroferrocyanic, H₄Fe(CN)₆

hydrofluorˈic adjective

Applied to an acid composed of fluorine and hydrogen, hydrogen fluoride

hydrofluorocarˈbon noun

An alkane in which some of the hydrogen atoms are substituted by fluorine atoms (cf fluorocarbon; abbrev HFC)

hydrogasificāˈtion noun

Production of methane from coal by treatment with hydrogen at high temperature and pressure

hydrosulˈphide noun

A compound formed by action of hydrogen sulphide on a hydroxide

hydrosulˈphite noun

A hyposulphite (esp sodium hyposulphite)

hydrosulphūˈric adjective

Formed by a combination of hydrogen and sulphur

hydroxˈide noun

A chemical compound that contains one or more hydroxyl groups

hydroxˈy adjective

(of a compound) containing one or more hydroxyl groups (often as combining form)

hydroxyapˈatite noun

A mineral that is a major constituent of bone and tooth enamel

hydroxˈyl noun

1. (Gr hȳlē matter) a compound radical consisting of one atom of oxygen and one of hydrogen
2. Sometimes loosely applied to hydrogen peroxide

hydroxylˈamine noun

A basic substance composed of a hydroxyl group and an amino group (NH₂OH)

hydroxˈylate transitive verb

To introduce hydroxyl into

hydroxyurēˈa noun

A compound derived from urea used as an antimetabolite in treating cancer