13-letter words containing d, o, r, a
- propagandizer — a person who engages in, or subjects others to, propaganda
- pros and cons — The pros and cons of something are its advantages and disadvantages, which you consider carefully so that you can make a sensible decision.
- prostaglandin — Biochemistry. any of a class of unsaturated fatty acids that are involved in the contraction of smooth muscle, the control of inflammation and body temperature, and many other physiological functions.
- prosthodontia — the branch of dentistry that deals with the restoration and maintenance of oral function by the replacement of missing teeth and other oral structures by artificial devices.
- protochordate — any of the nonvertebrate chordates, as the tunicates, cephalochordates, and hemichordates.
- provost guard — a detachment of soldiers assigned to police duties under the provost marshal.
- quadraphonics — high-fidelity sound reproduction involving signals transmitted through four different channels.
- quadrifarious — having four parts
- quadrifoliate — (botany) Having four leaves or leaflets.
- quadrillionth — a cardinal number represented in the U.S. by 1 followed by 15 zeros, and in Great Britain by 1 followed by 24 zeros.
- quadrilocular — having four compartments
- quadriphonics — quadraphony.
- quarter pound — a unit of weight equal to a quarter of a pound or 4 ounces avoirdupois
- quarter round — a molding, as on an ovolo, whose section is a quarter circle.
- quarter-bound — a style of bookbinding in which the spine is leather and the sides are cloth or paper.
- quartodeciman — one of a group of early Christians who observed Easter on the day of the Jewish Passover regardless of whether or not it was Sunday
- queen dowager — the widow of a king.
- radial motion — the component of the motion of a star away from or toward the earth along its line of sight, expressed in miles or kilometers per second and determined by the shift in the wavelength of light emitted by the star.
- radialization — the act of forming or arranging in a radial pattern
- radiation fog — fog produced by the nocturnal cooling of the surface boundary layer to a temperature at which its content of water vapor condenses.
- radiationless — not emitting or producing radiation
- radio compass — a radio receiver with a directional antenna for determining the bearing of the receiver from a radio transmitter.
- radio contact — communication or contact by means of radio waves
- radio control — remote control by means of radio signals from a transmitter
- radio horizon — the locus of points on the earth's surface where rays from a transmitting antenna are tangent to the surface. The radio horizon for a fixed antenna varies with refraction by the atmosphere of radio waves.
- radio silence — the absence, usually deliberately maintained, of radio transmissions
- radio station — station (def 8).
- radioactinium — the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227.
- radioactivate — to make (a substance) radioactive.
- radioactivity — the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element.
- radiochemical — pertaining to or involving radiochemistry.
- radiolocation — the method or process of determining the position and velocity of an object by radar.
- radiopacities — opaque to radiation; visible in x-ray photographs and under fluoroscopy (opposed to radiotransparent).
- radiotelegram — a message transmitted by radiotelegraphy.
- radioteletype — Also called radioteletypewriter [rey-dee-oh-tel-i-tahyp-rahy-ter, -tel-i-tahyp-rahy-] /ˌreɪ di oʊˌtɛl ɪˈtaɪpˌraɪ tər, -ˈtɛl ɪ taɪpˌraɪ-/ (Show IPA). a teletypewriter equipped for transmitting or receiving messages by radio instead of wire.
- radius vector — Mathematics. the length of the line segment joining a fixed point or origin to a given point.
- ragged school — (in Britain, formerly) a free elementary school for poor children
- railroad flat — an apartment whose series of narrow rooms forms a more or less straight line.
- railroad line — railway route
- railroad worm — the larva of a fruit fly, Rhagoletis pomonella, that burrows through apples, forming tunnels that sometimes appear on the skin as faint depressions or darkened trails: a serious pest of apples in colder regions of North America.
- raison d'etat — a purely political reason for governmental action, based on the national interest and often violating principles of justice.
- raison d'etre — reason or justification for being or existence: Art is the artist's raison d'être.
- random access — designating or of a volatile memory that allows data to be accessed directly and does not require following a sequence of storage locations
- random number — pseudorandom number
- random rubble — masonry in which untooled stones are set without coursing
- random sample — a statistical sample that is devised to avoid interference so that its distribution is affected only by, and so can be held to represent, that of the whole population
- random-access — direct-access.
- randomization — to order or select in a random manner, as in a sample or experiment, especially in order to reduce bias and interference caused by irrelevant variables; make random.
- rattle around — If you say that someone rattles around in a room or other space, you mean that the space is too large for them.
- re-forwarding — toward or at a place, point, or time in advance; onward; ahead: to move forward; from this day forward; to look forward.