13-letter words containing s, t, o, p, i
- optical glass — any of several types of high-quality, homogeneous, color-free glass, as flint or crown glass, having specified refractive properties, used in lenses and other components of optical systems.
- optical mouse — (hardware) Any kind of mouse that uses visible light or infrared to detect changes in its position.
- optical sound — sound recorded on and subsequently played back from an optical or photographic soundtrack, as opposed to a magnetic soundtrack.
- optimizations — Plural form of optimization.
- orchestra pit — musicians' seating in front of stage
- orchestra-pit — a group of performers on various musical instruments, including especially stringed instruments of the viol class, clarinets and flutes, cornets and trombones, drums, and cymbals, for playing music, as symphonies, operas, popular music, or other compositions.
- organotropism — Physiology. the attraction of microorganisms or chemical substances to particular organs or tissues of the body.
- orthographies — Plural form of orthography.
- osteopetrosis — any of several hereditary diseases characterized by increased bone density.
- osteophytosis — Lb medicine The presence of osteophytes.
- osteoplasties — Plural form of osteoplasty.
- outprocessing — to end a military tour of duty, accompanied by necessary paperwork: All enlisted soldiers out-process as a class.
- outwash plain — Geology. a broad, sloping landform built of coalesced deposits of outwash.
- over-shipment — an act or instance of shipping freight or cargo.
- ovipositional — pertaining to the laying of eggs through an ovipositor
- painted horse — paint (def 6).
- palaeocrystic — consisting of former glacial formation
- paleo-asiatic — a member of any of various Mongoloid peoples of northeastern Asia.
- palos heights — a city in NE Illinois, near Chicago.
- pan-teutonism — Pan-Germanism.
- pantheologist — a student of, or expert in, pantheology
- pantisocratic — relating to pantisocracy
- paper profits — an unrealized profit due to the appreciation of something owned but not yet sold.
- papillomatous — a benign tumor of the skin or mucous membrane consisting of hypertrophied epithelial tissue, as a wart.
- paradise lost — an epic poem (1667) by John Milton.
- parasitoidism — the feeding by certain insect larvae on host tissues such that the host remains alive until larval development is complete and then usually dies.
- parrot's-bill — a showy, vinelike plant, Clianthus puniceus, of New Zealand, having clusters of eight white-streaked, crimson flowers.
- parthian shot — a sharp, telling remark, act, gesture, etc., made in departing.
- passion fruit — any edible fruit of a passionflower, as the maypop.
- past anterior — a pluperfect verb (in French)
- past historic — the simple past
- pathomorphism — abnormal morphology.
- patriot's day — the third Monday in April, a legal holiday in Me. and Mass. commemorating the battles of Lexington and Concord (April 19, 1775)
- patriots' day — the anniversary of the battles of Lexington and Concord (1775), celebrated the third Monday in April: a legal holiday in Massachusetts and Maine.
- patripotestal — Anthropology. of or relating to the authority exercised by a father or a father's blood relatives.
- pentastichous — (of plant leaves) arranged in five vertical rows
- pentatonicism — the use of a five-tone scale.
- percussionist — a musician who plays percussion instruments.
- perfectionism — any of various doctrines holding that religious, moral, social, or political perfection is attainable.
- perfectionist — a person who adheres to or believes in perfectionism.
- periodicalist — a writer of articles for periodicals
- periodontitis — inflammation of the periodontium caused by bacteria that infect the roots of teeth and the surrounding gum crevices, producing bleeding, pus formation, and gradual loss of bone and the tissues that support the teeth. Compare pyorrhea (def 2).
- periodontosis — rapidly advancing juvenile periodontitis.
- perissodactyl — having an uneven number of toes or digits on each foot.
- perlustration — the act of perlustrating; a thorough inspection or survey, esp of letters for purposes of surveillance
- perscrutation — a very careful exploration or inspection
- perseveration — the act or process of perseverating.
- personalistic — Also called personal idealism. a modern philosophical movement locating ultimate value and reality in persons, human or divine.
- personalities — the visible aspect of one's character as it impresses others: He has a pleasing personality.
- petit treason — the killing of a husband by his wife, of a lord by his servant, or of an ecclesiastic by a subordinate ecclesiastic.