10-letter words containing o, p, t, a
- optionable — the power or right of choosing.
- optionally — left to one's choice; not required or mandatory: Formal dress is optional.
- optophobia — The fear of opening one's eyes.
- orange-tip — a European butterfly, Anthocharis cardamines, having whitish wings with orange-tipped forewings: family Pieridae
- organ stop — a set of organ pipes allowed to sound as a group by stopping all others
- orthograph — An orthographic projection.
- orthopnoea — difficult or painful breathing except in an erect sitting or standing position.
- orthopraxy — correctness or orthodoxy of action or practice.
- orthoptera — Any of very many four-winged insects, of the order Orthoptera, such as grasshoppers, crickets and locusts.
- osteopathy — a therapeutic system originally based upon the premise that manipulation of the muscles and bones to promote structural integrity could restore or preserve health: current osteopathic physicians use the diagnostic and therapeutic techniques of conventional medicine as well as manipulative measures.
- osteopenia — Reduced bone mass of lesser severity than osteoporosis.
- osteoplast — An osteoblast.
- outleaping — Present participle of outleap.
- outpassion — to surpass in passion
- outpatient — a patient who receives treatment at a hospital, as in an emergency room or clinic, but is not hospitalized.
- outplaying — Present participle of outplay.
- outsparkle — to sparkle more brilliantly than
- outspreads — Third-person singular simple present indicative form of outspread.
- overparted — (of a performer) having been cast in a role that is beyond his or her abilities
- oyster cap — an edible, brownish-gray to white mushroom, Pleurotus ostreatus, that grows in clusters on fallen trees and their stumps.
- packed out — If a place is packed out, it is very full of people.
- paddington — a former residential borough of Greater London, England, now part of Westminster.
- paddleboat — a boat propelled by a paddle wheel.
- paedotribe — (in ancient Greece) a gymnastics teacher
- pagination — Bibliography. the number of pages or leaves of a book, manuscript, etc., identified in bibliographical description or cataloging.
- paint bomb — a device containing paint which explodes on impact
- palaeolith — a stone tool dating to the Palaeolithic
- palaeotype — a system of Roman letters and symbols that represent spoken sounds
- palagonite — a yellow basaltic glass
- palatogram — Phonetics. a diagram or photograph obtained through palatography.
- palliation — to relieve or lessen without curing; mitigate; alleviate.
- palm court — a large room, usually in a prestigious hotel, where functions are staged, notably tea dances
- palmerston — Henry John Temple, 3rd Viscount, 1784–1865, British statesman: prime minister 1855–58, 1859–65.
- palo santo — a South American tree, Bulnesia sarmienti, of the caltrop family, yielding a fragrant essential oil.
- pancreato- — pancreas
- panic bolt — a bar that spans an emergency exit door on its interior and opens the latch when pressure is applied.
- panopticon — a building, as a prison, hospital, library, or the like, so arranged that all parts of the interior are visible from a single point.
- pansophist — someone with universal knowledge
- pantalones — pantaloons, a man's close-fitting garment for the hips and legs, worn especially in the 19th century, but varying in form from period to period; trousers.
- pantaloons — pantaloons, a man's close-fitting garment for the hips and legs, worn especially in the 19th century, but varying in form from period to period; trousers.
- pantheonic — a domed circular temple at Rome, erected a.d. 120–124 by Hadrian, used as a church since a.d.
- pantograph — Also, pantagraph. an instrument for the mechanical copying of plans, diagrams, etc., on any desired scale.
- pantomimed — the art or technique of conveying emotions, actions, feelings, etc., by gestures without speech.
- pantomimic — the art or technique of conveying emotions, actions, feelings, etc., by gestures without speech.
- pantophagy — the consumption of all types of food
- pantoscope — a panoramic camera
- pantothere — any animal of the extinct order Pantotheria that lived during the late Mesozoic Era, believed to be the ancestor of the marsupial and placental mammals.
- panzerotto — a baked turnover with a folded, sealed pocket containing tomato, cheese, and sometimes other fillings
- papiamento — a creolized language based on Spanish and spoken on Curaçao.
- papulation — the formation or development of papules