10-letter words containing o, p, t, a
- protanopia — a defect of vision in which the retina fails to respond to red or green.
- proteanism — readily assuming different forms or characters; extremely variable.
- protectant — a substance, as a chemical spray, that provides protection, as against insects, frost, rust, etc.; protective agent.
- proteinase — any of a group of enzymes that are capable of hydrolyzing proteins.
- protestant — any Western Christian who is not an adherent of a Catholic, Anglican, or Eastern Church.
- prothallus — prothallium.
- protistans — any of various one-celled organisms, classified in the kingdom Protista, that are either free-living or aggregated into simple colonies and that have diverse reproductive and nutritional modes, including the protozoans, eukaryotic algae, and slime molds: some classification schemes also include the fungi and the more primitive bacteria and blue-green algae or may distribute the organisms between the kingdoms Plantae and Animalia according to dominant characteristics.
- proto team — a team of workers trained to perform underground rescues
- protocolar — the customs and regulations dealing with diplomatic formality, precedence, and etiquette.
- protogenia — the first woman born after the great flood of Zeus, daughter of Deucalion and Pyrrha.
- protohuman — of, relating to, or resembling extinct hominid populations that had some but not all the features of modern Homo sapiens.
- protoplasm — Biology. (no longer in technical use) the colloidal and liquid substance of which cells are formed, excluding horny, chitinous, and other structural material; the cytoplasm and nucleus.
- protoplast — Biology. the contents of a cell within the cell membrane, considered as a fundamental entity. the primordial living unit or cell.
- protracted — to draw out or lengthen, especially in time; extend the duration of; prolong.
- protractor — a person or thing that protracts.
- provitamin — a substance that an organism can transform into a vitamin, as carotene, which is converted to vitamin A in the liver.
- pseudosalt — a compound whose formula is that of a salt, but that does not ionize in solution
- psychopath — a person with a psychopathic personality, which manifests as amoral and antisocial behavior, lack of ability to love or establish meaningful personal relationships, extreme egocentricity, failure to learn from experience, etc.
- pteranodon — a flying reptile of the extinct order Pterosauria, from the Cretaceous Period, having a wingspread of about 25 feet (8 meters).
- ptolemaeus — a walled plain in the third quadrant of the face of the moon: about 90 miles (144 km) in diameter.
- ptolemaist — an adherent or advocate of the Ptolemaic system of astronomy.
- pull about — to handle roughly
- pultaceous — resembling pap
- punctation — punctate condition or marking.
- punctuator — to mark or divide (something written) with punctuation marks in order to make the meaning clear.
- purgatoire — a river in SE Colorado, flowing NE to the Arkansas River. 186 miles (299 km) long.
- push about — to bully; keep telling (a person) what to do in a bossy manner
- put across — to move or place (anything) so as to get it into or out of a specific location or position: to put a book on the shelf.
- put to sea — the salt waters that cover the greater part of the earth's surface.
- pyatigorsk — a city in the SW Russian Federation in Europe, in Caucasia.
- pyroborate — borax1 .
- pyrolysate — a product of pyrolysis
- pyromantic — divination by fire, or by forms appearing in fire.
- pyrrophyta — a phylum in the kingdom Protista comprising the dinoflagellates and cryptomonads.
- pythagoras — c582–c500 b.c, Greek philosopher, mathematician, and religious reformer.
- quadcopter — A rotorcraft propelled by four rotors.
- radiophoto — an image created by radio waves rather than light
- rapportage — the factual reporting or recounting of events in writing
- rapporteur — a person responsible for compiling reports and presenting them, as to a governing body.
- rat poison — substance toxic to rodents
- readoption — the adoption of something or someone again
- reparation — the making of amends for wrong or injury done: reparation for an injustice.
- reparatory — tending to repair; repairing; mending.
- replicator — Any construct that acts to produce copies of itself; this could be a living organism, an idea (see meme), a program (see quine, worm, wabbit, fork bomb, and virus), a pattern in a cellular automaton (see life), or (speculatively) a robot or nanobot. It is even claimed by some that Unix and C are the symbiotic halves of an extremely successful replicator; see Unix conspiracy.
- repopulate — to inhabit; live in; be the inhabitants of.
- reportable — an account or statement describing in detail an event, situation, or the like, usually as the result of observation, inquiry, etc.: a report on the peace conference; a medical report on the patient.
- reprobator — an action taken to demonstrate that a witness should be disqualified or rejected on account of perjury or other cause of invalidity
- reputation — the estimation in which a person or thing is held, especially by the community or the public generally; repute: a man of good reputation.
- respirator — a masklike device, usually of gauze, worn over the mouth, or nose and mouth, to prevent the inhalation of noxious substances or the like.
- rhapsodist — a person who rhapsodizes.