11-letter words containing a, t, r, o
- protomartyr — the first Christian martyr, Saint Stephen.
- protonation — the act of providing an atom, molecule, or ion with a proton
- protonemata — a primary, usually filamentous structure produced by the germination of the spore in mosses and certain related plants, and from which the leafy plant which bears the sexual organs arises as a lateral or terminal shoot.
- protonotary — prothonotary.
- protopathic — noting or pertaining to a general, nondiscriminating responsiveness to pain or temperature stimuli (opposed to epicritic).
- protoplanet — the collection of matter, in the process of condensation, from which a planet is formed.
- protractile — capable of being protracted, lengthened, or protruded.
- protraction — the act of protracting; prolongation; extension.
- protractive — to draw out or lengthen, especially in time; extend the duration of; prolong.
- protuberant — bulging out beyond the surrounding surface; protruding; projecting: protuberant eyes.
- protuberate — to bulge out, forming a rounded projection.
- provocateur — a person who provokes trouble, causes dissension, or the like; agitator.
- provocation — the act of provoking.
- provocative — tending or serving to provoke; inciting, stimulating, irritating, or vexing.
- provocatory — tending to provoke
- proximately — next; nearest; immediately before or after in order, place, occurrence, etc.
- proximation — next; nearest; immediately before or after in order, place, occurrence, etc.
- pterodactyl — any of a number of genera of flying reptiles of the extinct order Pterosauria, from the Jurassic and Cretaceous periods, having a highly reduced tail and teeth and a birdlike beak.
- ptochocracy — government by the poor
- pulveration — the reduction of something to powder
- purgatorial — removing or purging sin; expiatory: purgatorial rites.
- purgatorian — a person who believes in purgatory
- purificator — the linen cloth used by the celebrant for wiping the chalice after each communicant has drunk from it.
- pursuant to — legal: in accordance with
- put forward — 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 on airs — a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere.
- pyroclastic — composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks; volcaniclastic.
- pyrogallate — a salt or ether of pyrogallol.
- pyrosulfate — a salt of pyrosulfuric acid.
- pythagorean — of or relating to Pythagoras, to his school, or to his doctrines.
- quadripoint — A point at which four borders meet.
- quantometer — a spectroscopic instrument for measuring the percentage of different metals present in a sample
- quart major — Piquet. a sequence of four cards of the same suit, as an ace, king, queen, and jack (quart major) or king, queen, jack, and ten (quart minor)
- quart minor — Piquet. a sequence of four cards of the same suit, as an ace, king, queen, and jack (quart major) or king, queen, jack, and ten (quart minor)
- quaternions — Plural form of quaternion.
- quatrefoils — Plural form of quatrefoil.
- questionary — a questionnaire.
- quick ratio — A quick ratio is a measure of liquidity that is calculated by dividing current assets minus inventories by current liabilities.
- quint major — an organ stop sounding a fifth higher than the corresponding digitals.
- rabbit food — raw vegetables, especially those used in salads, as lettuce, carrots, radishes, or celery.
- rabbit hole — opening of a rabbit's burrow
- radioactive — of, pertaining to, exhibiting, or caused by radioactivity.
- radiologist — the science dealing with x-rays or nuclear radiation, especially for medical uses.
- radiolucent — almost entirely transparent to radiation; almost entirely invisible in x-ray photographs and under fluoroscopy.
- radiometric — Also called Crookes radiometer. an instrument for demonstrating the transformation of radiant energy into mechanical work, consisting of an exhausted glass vessel containing vanes that revolve about an axis when exposed to light.
- radiopacity — opaque to radiation; visible in x-ray photographs and under fluoroscopy (opposed to radiotransparent).
- radiothermy — therapy that utilizes the heat from a shortwave radio apparatus or diathermy machine.
- radiotracer — a radioactive isotope used as a tracer.
- radix point — a point, such as the decimal point in the decimal system, separating the integral part of a number from the fractional part
- rain forest — a tropical forest, usually of tall, densely growing, broad-leaved evergreen trees in an area of high annual rainfall.