19-letter words containing h, e, r, l
- emergency telephone — a public telephone intended for use in emergencies: for example, at the side of a motorway
- equatorial zenithal — a type of map projection in which part of the earth's surface is projected onto a plane tangential to it at the equator
- estate of the realm — an order or class of persons in a political community, regarded collectively as a part of the body politic: usually regarded as being the lords temporal (peers), lords spiritual, and commons
- euclidean algorithm — Euclid's Algorithm
- exophthalmic goiter — a disease of unknown cause characterized by enlargement of the thyroid gland, overproduction of the thyroid hormone, and abnormal protrusion of the eyeballs
- exophthalmic goitre — a form of hyperthyroidism characterized by enlargement of the thyroid gland, protrusion of the eyeballs, increased basal metabolic rate, and weight loss
- feather-tail glider — pygmy glider.
- fifth-wheel trailer — a horizontal ring or segment of a ring, consisting of two bands that slide on each other, placed above the front axle of a carriage and designed to support the forepart of the body while allowing it to turn freely in a horizontal plane.
- finger on the pulse — If you have your finger on the pulse of something, you know all the latest opinions or developments concerning it.
- flame-of-the-forest — a leguminous tree, Butea frondosa, native to E India and Myanmar, having hanging clusters of scarlet flowers
- flannelmouth sucker — a sucker, Catostomus latipinnis, of the Colorado River and its tributaries.
- flavor of the month — Informal. the subject of intense, usually temporary interest; the current fashion.
- fluoride toothpaste — toothpaste containing a small amount of fluoride as protection against tooth decay
- focal plane shutter — an opaque shield in a camera, lying in the focal plane of the lens, that, when tripped, admits light to expose the film or plate for a predetermined period, usually a fraction of a second
- focal-plane shutter — a camera shutter situated directly in front of the film.
- for the life of one — the condition that distinguishes organisms from inorganic objects and dead organisms, being manifested by growth through metabolism, reproduction, and the power of adaptation to environment through changes originating internally.
- four colour theorem — four colour map theorem
- free alongside ship — (of a shipment of goods) delivered to the dock without charge to the buyer, but excluding the cost of loading onto the vessel
- frontier technology — innovative or new technology
- gas central heating — a system of central heating fuelled by combustible gas
- gel electrophoresis — a technique for separating protein molecules of varying sizes in a mixture by moving them through a block of gel, as of agarose or polyacrylamide, by means of an electric field, with smaller molecules moving faster and therefore farther than larger ones.
- general anaesthesia — the use of a general anaesthetic
- general anaesthetic — sth administered to induce unconsciousness
- general of the army — the highest ranking military officer; the next rank above general.
- general partnership — a partnership in which each of the partners is fully liable for the firm's debts.
- geothermal gradient — the increase in temperature with increasing depth within the earth.
- go to great lengths — If you say that someone goes to great lengths to achieve something, you mean that they try very hard and perhaps do extreme things in order to achieve it.
- goldbach conjecture — an unproved theorem that every even integer greater than 2 can be written as the sum of two prime numbers.
- grand duke nicholas — of Cusa [kyoo-zuh] /ˈkyu zə/ (Show IPA), 1401–1464, German cardinal, mathematician, and philosopher. German Nikolaus von Cusa.
- grandfather's clock — a pendulum floor clock having a case as tall as or taller than a person; tall-case clock; long-case clock.
- grandmother's clock — a pendulum clock similar to a grandfather's clock but shorter.
- grasshopper warbler — a Eurasian warbler Locustella naevia
- great wall of china — a system of fortified walls with a roadway along the top, constructed as a defense for China against the nomads of the regions that are now Mongolia and Manchuria: completed in the 3rd century b.c., but later repeatedly modified and rebuilt. 2000 miles (3220 km) long.
- great-grandchildren — a grandchild of one's son or daughter.
- greenhouse whitefly — See under whitefly.
- hairy cell leukemia — a form of cancer in which abnormal cells with many hairlike cytoplasmic projections appear in the bone marrow, liver, spleen, and blood.
- half wave rectifier — A half wave rectifier removes the negative component of an alternating signal leaving only the positive part.
- half-wave rectifier — a rectifier that changes only one half of a cycle of alternating current into a pulsating, direct current.
- halt and catch fire — (humour, processor) (HCF) Any of several undocumented and semi-mythical machine instructions with destructive side-effects, supposedly included for test purposes on several well-known architectures going as far back as the IBM 360. The Motorola 6800 microprocessor was the first for which an HCF opcode became widely known. This instruction caused the processor to read every memory location sequentially until reset.
- hamiltonian problem — (computability) (Or "Hamilton's problem") A problem in graph theory posed by William Hamilton: given a graph, is there a path through the graph which visits each vertex precisely once (a "Hamiltonian path")? Is there a Hamiltonian path which ends up where it started (a "Hamiltonian cycle" or "Hamiltonian tour")? Hamilton's problem is NP-complete. It has numerous applications, sometimes completely unexpected, in computing.
- handlebar moustache — a man's moustache having long, curved ends that resemble the handlebars of a bicycle.
- haul over the coals — a black or dark-brown combustible mineral substance consisting of carbonized vegetable matter, used as a fuel. Compare anthracite, bituminous coal, lignite.
- haute vulgarisation — vulgarization, or popularization, on a higher level, esp. as done by academics, scholars, etc.
- have a problem with — to be unable to understand or do
- health professional — a person trained to work in any field of physical or mental health.
- heel-and-toe racing — race walking.
- heine-borel theorem — the theorem that in a metric space every covering consisting of open sets that covers a closed and compact set has a finite collection of subsets that covers the given set.
- heinrich schliemann — Heinrich [hahyn-rikh] /ˈhaɪn rɪx/ (Show IPA), 1822–90, German archaeologist: excavated ancient cities of Troy and Mycenae.
- helsinki conference — Conference on Security and Cooperation in Europe.
- hepatic portal vein — a vein connecting two capillary networks in the liver