18-letter words containing h, o, t
- 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.
- photodecomposition — the breaking down of molecules by radiant energy.
- photoelectric cell — photocell.
- photoisomerization — isomerization induced by light.
- photomorphogenesis — plant development that is controlled by light.
- photosensitization — to make (a material) photosensitive, as by the application of a photosensitive emulsion.
- 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.
- pigmy hippopotamus — a related but smaller animal, Choeropsis liberiensis
- pitch-and-run shot — chip shot.
- planned parenthood — an organization that gives out information on the planning of the number and spacing of the births of one's children, as through the use of birth-control measures
- 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
- pollen mother cell — one of the mother cells that produce four microspores by meiosis.
- 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.
- porter-house steak — Also called porterhouse steak. a choice cut of beef from between the prime ribs and the sirloin.
- 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
- pound the pavement — a paved road, highway, etc.
- preparatory school — a private or parochial secondary school, especially one boarding its students and providing a college-preparatory education.
- prepare the ground — make conditions ready
- press photographer — a photographer who works for a newspaper, magazine, etc
- prison authorities — the people in charge of running a prison
- probability theory — the theory of analyzing and making statements concerning the probability of the occurrence of uncertain events. Compare probability (def 4).
- processionary moth — a moth of the family Thaumetopoeidae, esp the oak processionary moth (Thaumetopoea processionea), the larvae of which leave the communal shelter nightly for food in a V-shaped procession
- projection machine — an apparatus that projects motion pictures; projector.
- prometheus unbound — a drama in verse (1820) by Shelley.
- proprietary rights — rights of ownership
- protease inhibitor — a drug that inhibits the action of protease, especially any of a class of antiviral drugs that prevent the cleavage and replication of HIV proteins.
- proton synchrotron — a synchrotron used for accelerating protons.
- provision merchant — a person or company in the business of retailing food and other provisions
- pseudo-anarchistic — a person who advocates or believes in anarchy or anarchism.
- psychogalvanometer — a type of galvanometer for detecting and measuring psychogalvanic currents.
- psychopathological — the science or study of mental disorders.
- psychotechnologist — a specialist in psychotechnology
- psychotherapeutics — psychotherapy.
- puerto rico trench — a depression in the ocean floor, N of Puerto Rico: includes deepest part of Atlantic Ocean, 28,374 feet (8648 meters).
- puss in the corner — a parlor game for children in which one player in the middle of a room tries to occupy any of the positions along the walls that become vacant as other players dash across to exchange places at a signal.
- put heads together — the upper part of the body in humans, joined to the trunk by the neck, containing the brain, eyes, ears, nose, and mouth.
- put one's shirt on — to bet all one has on (a horse, etc)
- put the clock back — to regress
- put the mockers on — stop, thwart
- pygmy hippopotamus — a small hippopotamus, Choeropsis liberiensis, of forests and swamps in western Africa.
- quick off the mark — If you are quick off the mark, you are quick to understand or respond to something. If you are slow off the mark, you are slow to understand or respond to something.