18-letter words containing h, i, l, t, o
- north lincolnshire — a unitary authority of NE England, in Lincolnshire: formerly (1975–96) part of the county of Humberside. Pop: 155 000 (2003 est). Area: 1497 sq km (578 sq miles)
- north polar region — the region of land and water surrounding the North Pole.
- not a hope in hell — If you say that someone has not got a hope in hell of doing something, you are emphasizing that they will not be able to do it.
- oath of allegiance — pledge to one's nation
- octachlorobiphenyl — (organic compound) Either of twelve isomers of the polychlorinated biphenyl containing eight chlorine atoms.
- offset lithography — offset (def 6).
- oil of catechumens — holy oil used in baptism, the ordination of a cleric, the coronation of a sovereign, or in the consecration of a church.
- old curiosity shop — a novel (1840–41) by Dickens.
- on the danger list — critically ill in hospital
- ophthalmologically — In an ophthalmological manner.
- optical brightener — an additive that dyes and brightens fabric or paper
- oriental cockroach — a dark-brown cockroach, Blatta orientalis, thought to have originated in Asia but now nearly cosmopolitan in distribution.
- oriental shorthair — any of a breed of domestic cat, similar to the Siamese but with greenish eyes and often a coat of a solid color
- orthophthalic acid — Chemistry. any of three isomeric acids having the formula C 8 H 6 O 4 , especially the ortho isomer (orthophthalic acid) a colorless, crystalline, slightly water-soluble solid used chiefly in the manufacture of dyes, medicine, and perfume.
- overnight telegram — a type of domestic telegram sent at a reduced rate with a minimum charge for 10 words or less and accepted until midnight for delivery the following day.
- parathyroid glands — any of several small oval glands usually lying near or embedded in the thyroid gland.
- pathologic anatomy — the branch of pathology dealing with the morphologic changes in tissues.
- phanerocrystalline — (of a rock) having the principal constituents in the form of crystals visible to the naked eye.
- phantasmagorically — having a fantastic or deceptive appearance, as something in a dream or created by the imagination.
- phantom withdrawal — the unauthorized removal of funds from a bank account using an automated teller machine
- phenol coefficient — the number indicating the effectiveness of a disinfectant as a germicide relative to phenol, which is arbitrarily assigned the number 1: based on the time required to kill a given quantity of a specific type of bacteria.
- philharmonic pitch — a standard of pitch in which A above middle C is established at 440 vibrations per second.
- phosphatidylserine — any of a class of phospholipids occurring in biological membranes and fats
- photochemical smog — air pollution containing ozone and other reactive chemical compounds formed by the action of sunlight on nitrogen oxides and hydrocarbons, especially those in automobile exhaust.
- photoelectric cell — photocell.
- physical education — systematic instruction in sports, exercises, and hygiene given as part of a school or college program.
- physical inventory — To carry out a physical inventory is to count all the stock on hand.
- phytohemagglutinin — a lectin, obtained from the red kidney bean, that binds to the membranes of T cells and stimulates metabolic activity, cell division, etc.
- pick of the litter — objects strewn or scattered about; scattered rubbish.
- plight one's troth — to make a promise of marriage
- policeman's helmet — a Himalayan balsaminaceous plant, Impatiens glandulifera, with large purplish-pink flowers, introduced into Britain
- polychromatophilic — having an affinity for more than one kind of stain, especially for acid, neutral, and basic stains, as polychromatophilic erythroblasts characteristic of pernicious anemia.
- positively charged — having a positive charge
- potassium chlorate — a white or colorless, crystalline, water-soluble, poisonous solid, KClO 3 , used chiefly as an oxidizing agent in the manufacture of explosives, fireworks, matches, bleaches, and disinfectants.
- potassium chloride — a white or colorless, crystalline, water-soluble solid, KCl, used chiefly in the manufacture of fertilizers and mineral water, and as a source of other potassium compounds.
- potassium sulphate — a soluble substance usually obtained as colourless crystals of the decahydrate: used in making glass and as a fertilizer. Formula: K2SO4
- probability theory — the theory of analyzing and making statements concerning the probability of the occurrence of uncertain events. Compare probability (def 4).
- psychopathological — the science or study of mental disorders.
- psychotechnologist — a specialist in psychotechnology
- residential school — (in Canada) a boarding school maintained by the Canadian government for Indian and Inuit children from sparsely populated settlements
- rhode island white — one of a dual-purpose American breed of chickens having white feathers and a rose comb.
- right-to-work laws — a state law making it illegal to refuse employment to a person for the sole reason that he or she is not a union member.
- rotary clothesline — an apparatus of radiating spokes that support lines on which clothes are hung to dry
- rub shoulders with — to mix with socially or associate with
- rubbish collection — the collection of domestic refuse for disposal
- schleswig-holstein — two contiguous duchies of Denmark that were a center of international tension in the 19th century: Prussia annexed Schleswig 1864 and Holstein 1866.
- school certificate — (in England and Wales between 1917 and 1951 and currently in New Zealand) a certificate awarded to school pupils who pass a public examination: the equivalent of GCSE
- school of motoring — a centre where people pay for lessons to learn to drive
- scottish blackface — a common breed of hardy mountain sheep having horns and a black face, kept chiefly on the mainland of Scotland
- september holidays — a period of time in September when people do not have to go to school, college or work