17-letter words containing a, r, c, h, l
- hard rock geology — (loosely) of or relating to igneous or metamorphic rocks, as in mining (hard-rock mining) and geology (hard-rock geology)
- hard-shelled clam — quahog
- hard-shelled crab — a crab, esp. an edible sea crab, before it has shed its hard shell
- harmonic analysis — the calculation of Fourier series and their generalization.
- harmonic interval — an intervening period of time: an interval of 50 years.
- haroun-al-raschid — Harun al-Rashid.
- health care proxy — a legal document in which a person can appoint someone to make decisions about medical treatment in the event that he or she is no longer mentally competent or able to communicate.
- heimlich maneuver — an emergency rescue procedure for application to someone choking on a foreign object, in which the rescuer places a fist between the victim's lower ribs or upper abdomen from behind and exerts sudden pressure in the form of thrusts of sufficient force to help eject the object from the windpipe.
- helicopter parent — a style of child rearing in which an overprotective mother or father discourages a child's independence by being too involved in the child's life: In typical helicopter parenting, a mother or father swoops in at any sign of challenge or discomfort.
- henry cabot lodge — Henry Cabot, 1850–1924, U.S. public servant and author: senator 1893–1924.
- heterochlamydeous — (of a plant) having a perianth consisting of distinct sepals and petals
- high-carbon steel — steel containing between 0.5 and 1.5 per cent carbon
- hippocampal gyrus — a convolution on the inner surface of the temporal lobe of the cerebrum, bordering the hippocampus.
- histamine blocker — any of various substances that act at a specific receptor site to block certain actions of histamine.
- historical method — the process of establishing general facts and principles through attention to chronology and to the evolution or historical course of what is being studied.
- historical school — a school of economists that arose in Germany in the 19th century in reaction to the principles of the classical economists, and that maintained that the factors making up an economy are variable and develop out of social institutions.
- historiographical — the body of literature dealing with historical matters; histories collectively.
- ho chi minh trail — a network of jungle paths winding from North Vietnam through Laos and Cambodia into South Vietnam, used as a military route by North Vietnam to supply the Vietcong during the Vietnam War.
- homeland security — national defence
- horticulturalists — Plural form of horticulturalist.
- household cavalry — (in Britain) cavalry units forming part of the ceremonial guard of the monarch.
- hyaline cartilage — the typical, translucent form of cartilage, containing little fibrous tissue.
- hydraulic circuit — a circuit through which water or another liquid, instead of electric current, flows, but which otherwise operates in the same way as an electric circuit
- hydrochloric acid — a colorless or faintly yellow, corrosive, fuming liquid, HCl, used chiefly in chemical and industrial processes.
- hydroelectrically — Using hydroelectric power.
- hydrofluoric acid — a colorless, fuming, corrosive liquid, HF, an aqueous solution of hydrogen fluoride, used chiefly for etching glass.
- hydrofluorocarbon — Any of a class of partly chlorinated and fluorinated hydrocarbons, used as an alternative to chlorofluorocarbons in foam production, refrigeration, and other processes.
- hyperbolic secant — a hyperbolic function that is the reciprocal of cosh; sech
- hyperbolic spiral — rθ = a, (where a is a constant)
- hyperchlorination — Chemistry. to combine or treat with chlorine. to introduce chlorine atoms into an organic compound by an addition or substitution reaction.
- hyperexcitability — an excessive reaction to stimuli.
- hyperintellectual — appealing to or engaging the intellect: intellectual pursuits.
- hypochlorous acid — a weak, unstable acid, HOCl, existing only in solution and in the form of its salts, used as a bleaching agent and disinfectant.
- hypocholesteremia — an abnormally low amount of cholesterol in the blood.
- hypochondriacally — In a hypochondriacal manner.
- ignoratio elenchi — the fallacy of offering proof irrelevant to the proposition in question.
- indecipherability — Quality of being indecipherable.
- industrial school — a school for teaching one or more branches of industry; trade or vocational school.
- integrated school — (in New Zealand) a private or church school that has joined the state school system
- iontophoretically — By means of iontophoresis.
- isomorphism class — (mathematics) A collection of all the objects isomorphic to a given object. Talking about the isomorphism class (of a poset, say) ensures that we will only consider its properties as a poset, and will not consider other incidental properties it happens to have.
- isopropyl alcohol — a colorless, flammable, water-soluble liquid, C 3 H 8 O, produced from propylene by the action of sulfuric acid and hydrolysis: used chiefly in the manufacture of antifreeze and rubbing alcohol and as a solvent.
- john of lancaster — Duke of Bedford, 1389–1435, Bedford, John of Lancaster, Duke of.
- julian of norwich — ?1342–?1413, English mystic and anchoress: best known for the Revelations of Divine Love describing her visions
- laboratory school — a school maintained by a college or university for the training of student teachers.
- ladder-back chair — a chair with a back of two upright posts connected by horizontal slats
- lancashire heeler — a small sturdy dog of a breed with a short thick black or liver-coloured coat with tan markings, often used for herding cattle
- law of trichotomy — the property that for natural numbers a and b , either a is less than b , a equals b , or a is greater than b .
- lexicographically — the writing, editing, or compiling of dictionaries.
- lithium carbonate — a colorless crystalline compound, Li 2 CO 3 , slightly soluble in water: used in ceramic and porcelain glazes, pharmaceuticals, and luminescent paints.