18-letter words containing h, a, t, i
- photoisomerization — isomerization induced by light.
- photosensitization — to make (a material) photosensitive, as by the application of a photosensitive emulsion.
- phthalic anhydride — a white, crystalline, slightly water-soluble solid, C 8 H 4 O 3 , used chiefly in the manufacture of dyes, alkyd resins, and plasticizers.
- physical chemistry — the branch of chemistry dealing with the relations between the physical properties of substances and their chemical composition and transformations.
- 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.
- physical therapist — sb who performs physiotherapy
- phytohemagglutinin — a lectin, obtained from the red kidney bean, that binds to the membranes of T cells and stimulates metabolic activity, cell division, etc.
- pigmy hippopotamus — a related but smaller animal, Choeropsis liberiensis
- pitch-and-run shot — chip shot.
- 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
- 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.
- 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.
- 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.
- psychopathological — the science or study of mental disorders.
- psychotherapeutics — psychotherapy.
- punishment beating — a form of corporal punishment carried out by a paramilitary organization on a member of another sectarian organization, usually in Northern Ireland
- pygmy hippopotamus — a small hippopotamus, Choeropsis liberiensis, of forests and swamps in western Africa.
- pyramus and thisbe — (in Greek legend) two lovers of Babylon: Pyramus, wrongly supposing Thisbe to be dead, killed himself and she, encountering him in his death throes, did the same
- quasi-metaphysical — pertaining to or of the nature of metaphysics.
- 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.
- quite the contrary — not at all, the very opposite
- rear its ugly head — the upper part of the body in humans, joined to the trunk by the neck, containing the brain, eyes, ears, nose, and mouth.
- recharacterization — portrayal; description: the actor's characterization of a politician.
- registered charity — official aid organization
- research assistant — a graduate who is employed on a temporary or part-time basis to assist the university with academic research
- research scientist — someone who conducts scientific research or investigation, in order to discover new things, etc
- research-intensive — focusing financial and other resources on research and development as opposed to capital and labor; noting or pertaining to a high ratio of expenditure on research in relation to the value of net output.
- residential school — (in Canada) a boarding school maintained by the Canadian government for Indian and Inuit children from sparsely populated settlements
- resistance fighter — someone who fights (for freedom, etc) against an invader in an occupied country, or against their government, etc, often secretly or illegally
- rhode island white — one of a dual-purpose American breed of chickens having white feathers and a rose comb.
- rhyming dictionary — a specialist dictionary organized by the final sounds of words, used to write poetry
- 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.
- roman architecture — buildings in style of ancient Rome
- rotary clothesline — an apparatus of radiating spokes that support lines on which clothes are hung to dry
- saint john's bread — carob (def 2).
- saint peter's fish — another name for tilapia, taken from a Bible story about Saint Peter catching a fish with a coin in its mouth
- salem witch trials — 17th-century witchcraft case
- say/kiss goodnight — If you say goodnight to someone or kiss them goodnight, you say something such as 'Goodnight' to them or kiss them before one of you goes home or goes to sleep.
- 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