15-letter words containing t, h, i, o
- overachievement — to perform, especially academically, above the potential indicated by tests of one's mental ability or aptitude.
- oyster toadfish — See under toadfish (def 1).
- palaeoanthropic — relating to palaeoanthropology
- paleolithic man — any of the prehistoric populations of humans, as the Cro-Magnon, living in the late Pliocene and the Pleistocene epochs.
- panophthalmitis — the inflammation of all eye tissue
- panoramic sight — an artillery sight that can be rotated horizontally in a full circle.
- paraheliotropic — (of leaves) turning away from light; sun-avoiding
- parthenogenesis — development of an egg without fertilization.
- parthenogenetic — development of an egg without fertilization.
- patagonian hare — a burrowing, gray, long-eared and long-legged cavy of the genus Dolichotis, native to South America.
- patchwork quilt — cover sewn from patches of cloth
- pathophysiology — the physiology of abnormal or diseased organisms or their parts; the functional changes associated with a disease or syndrome.
- pavel petrovich — Paul I (def 2).
- payment holiday — a break taken from paying ( a debt etc) back
- pentaerythritol — a white, crystalline, water-soluble powder, C 5 H 1 2 O 4 , used chiefly in the manufacture of alkyd resins, varnishes, plasticizers, and explosives.
- pepin the short — ("Pepin the Short") died a.d. 768, king of the Franks 751–768 (father of Charlemagne).
- phantom circuit — a circuit derived from two suitably arranged pairs of wires, each pair being a circuit (side circuit) and also acting as one half of an additional derived circuit, the entire system providing the capabilities of three circuits while requiring wires for only two.
- phenakistoscope — an early form of a zoetrope in which figures are depicted in different poses around the edge of a disc. When the disc is spun, and the figures observed through the apertures around the edge of the disc, they appear to be moving
- phenolphthalein — a white, crystalline compound, C 2 0 H 1 4 O 4 , used as an indicator in acid-base titration and as a laxative.
- phenomenalistic — the doctrine that phenomena are the only objects of knowledge or the only form of reality.
- phenomenologist — the study of phenomena.
- phenylketonuria — an inherited disease due to faulty metabolism of phenylalanine, characterized by phenylketones in the urine and usually first noted by signs of mental retardation in infancy.
- phenylketonuric — an inherited disease due to faulty metabolism of phenylalanine, characterized by phenylketones in the urine and usually first noted by signs of mental retardation in infancy.
- philanthropical — of, pertaining to, engaged in, or characterized by philanthropy; benevolent: a philanthropic foundation.
- philip the bold — 1342–1404, duke of Burgundy (1363–1404), noted for his courage at Poitiers (1356) in the Hundred Years' War: regent of France for his nephew Charles VI (1368–88, 1392–1404)
- philip the good — 1396–1467, duke of Burgundy 1419–67.
- phonautographic — relating to a phonautograph or a piece of equipment that records sound visually by detecting the sound waves and indicating them on a graph
- phonemicization — a grouping of phonemes
- phoneticization — the representation of speech in writing using a system in which individual symbols reflect speech sounds in a regular manner
- phosphocreatine — a compound, C 4 H 1 0 O 5 N 3 P, found chiefly in muscle, formed by the enzymatic interaction of an organic phosphate and creatine, the breakdown of which provides energy for muscle contraction.
- phosphorylation — to introduce the phosphoryl group into (an organic compound).
- phosphorylative — of or relating to phosphorylation
- photo-secession — an association of photographers founded in New York City in 1902 by Alfred Stieglitz and Edward Steichen that advocated the development and public recognition of photography as a fine art.
- photoactivation — the activation or control of a chemical, chemical reaction, or organism by light, as the activation of chlorophyll by sunlight during photosynthesis.
- photoconducting — of or relating to photoconduction
- photoconduction — of, relating to, or exhibiting photoconductivity.
- photoconductive — of, relating to, or exhibiting photoconductivity.
- photodissociate — to split or break up molecules as a result of the absorption of photons
- photoelasticity — the phenomenon of double refraction of polarized light by a transparent substance under elastic stress, used to measure strain in elastic, transparent materials.
- photoelectronic — relating to electronic effects or devices affected by light
- photoexcitation — the creation of an increase in energy in atoms, molecules or ions caused by the absorption of a photon
- photoheliograph — an instrument for photographing the sun, consisting of a camera and a specially adapted telescope.
- photoionization — the phenomenon in which the absorption of electromagnetic radiation by an atom in a gas induces the atom to emit a bound electron and thereby become ionized.
- photojournalism — journalism in which photography dominates written copy, as in certain magazines.
- photolithograph — Also, photolithoprint [foh-tuh-lith-uh-print] /ˌfoʊ təˈlɪθ əˌprɪnt/ (Show IPA). a lithograph printed from a stone or the like upon which a picture or design has been formed by photography.
- photomechanical — noting or pertaining to any of various processes for printing from plates or surfaces prepared by the aid of photography.
- photomicrograph — a photograph taken through a microscope.
- photomicroscope — a microscope having an illuminator and a camera mechanism for producing a photomicrograph.
- photomultiplier — an extremely sensitive detector of light and of other radiation, consisting of a tube in which the electrons released by radiation striking a photocathode are accelerated, greatly amplifying the signal obtainable from small quantities of radiation.
- photoproduction — the light-induced production of a species of molecule such as a radical or ion