15-letter words containing r, h, d, i
- heart condition — cardiac disorder
- heaviside layer — E layer.
- henry cavendish — Henry, 1731–1810, English chemist and physicist.
- heralds' office — the official heraldic authority of Scotland.
- herbal medicine — the use of herbs to treat illness
- hereditarianism — a person who believes that differences between individuals or groups, including moral and intellectual attributes, are predominantly determined by genetic factors (opposed to environmentalist).
- hereditarianist — a person who believes in the doctrine of hereditarianism
- heredo-familial — denoting a condition or disease that may be passed from generation to generation and to several members of one family
- hermaphroditism — the condition of being a hermaphrodite.
- herod agrippa i — 10 bc–44 ad, king of Judaea (41–44), grandson of Herod (the Great). A friend of Caligula and Claudius, he imprisoned Saint Peter and executed Saint James
- heroin overdose — an excessive amount of the drug heroin, sufficient to cause illness or death
- heteroscedastic — (of several distributions) having different variances
- high priesthood — the condition or office of a high priest.
- high-fibre diet — a diet which contains a lot of fibre, supposed to help keep your digestive system healthy
- high-principled — possessing or displaying very high moral or ethical principles
- hindenburg line — a line of elaborate fortifications established by the German army in World War I, near the French-Belgian border, from Lille SE to Metz.
- holding furnace — a small furnace for holding molten metal produced in a larger melting furnace at a desired temperature for casting.
- holding pattern — a traffic pattern for aircraft at a specified location (holding point) where they are ordered to remain until permitted to land or proceed.
- holiday traffic — increased road traffic during holiday periods and public holidays
- horse latitudes — the latitudes near 30°N or 30°S at sea, characterized by baffling winds, calms, and high barometric pressure
- hospital doctor — a hospital doctor works in a hospital, rather than as a general practitioner, in the army, etc
- humpback bridge — arched bridge
- hunting leopard — the cheetah.
- huntingdonshire — a former county in E England, now part of Cambridgeshire.
- hurdle champion — a hurdler who has defeated all others in a competition
- hyaluronic acid — a mucopolysaccharide serving as a viscous medium in the tissues of the body and as a lubricant in joints.
- hybrid antibody — a synthetic antibody that is able to combine with two different antigens
- hybrid computer — a computer system containing both analog and digital hardware.
- hydraulic brake — a brake operated by fluid pressures in cylinders and connecting tubular lines.
- hydraulic fluid — a fluid, usually of low viscosity, as oil, used in a hydraulic system.
- hydraulic motor — a motor that converts the kinetic or potential energy of a fluid into mechanical energy.
- hydraulic press — a machine permitting a small force applied to a small piston to produce, through fluid pressure, a large force on a large piston.
- hydrobiological — of or relating to hydrobiology
- hydrodynamicist — a specialist in hydrodynamics.
- hydrofracturing — a process in which fractures in rocks below the earth's surface are opened and widened by injecting chemicals and liquids at high pressure: used especially to extract natural gas or oil.
- hydrogen iodide — a colorless gas, HI, having a suffocating odor: the anhydride of hydriodic acid.
- hydromechanical — Of or pertaining to hydromechanics.
- hydropathically — in a hydropathic manner; in a manner relating to hydropathy
- hydrostatically — In a hydrostatic manner.
- hydroxonium ion — a positive ion, H3O+, formed by the attachment of a proton to a water molecule: occurs in solutions of acids and behaves like a hydrogen ion
- hydroxycoumarin — (organic compound) Any of several isomeric hydroxy derivatives of coumarin, some of which are the basis of pharmaceuticals.
- hydroxylapatite — Alternative spelling of hydroxyapatite.
- hyperadrenalism — a glandular disorder caused by the overactivity of the adrenal glands and often resulting in obesity
- hyperdemocratic — pertaining to or of the nature of democracy or a democracy.
- hyperfastidious — extremely or excessively fastidious
- hyperlipidaemia — Alternative spelling of hyperlipidemia.
- hyperlipoidemia — An abnormally high level of lipoids in the blood.
- hyperproduction — an increased or excessive production or output
- hypersensitized — Simple past tense and past participle of hypersensitize.
- hypersexualised — Simple past tense and past participle of hypersexualise.