13-letter words containing a, n, d, i, r, o
- propagandizer — a person who engages in, or subjects others to, propaganda
- 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.
- quadraphonics — high-fidelity sound reproduction involving signals transmitted through four different channels.
- 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.
- quadriphonics — quadraphony.
- 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
- 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 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.
- radiolocation — the method or process of determining the position and velocity of an object by radar.
- railroad line — railway route
- 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.
- 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.
- re-forwarding — toward or at a place, point, or time in advance; onward; ahead: to move forward; from this day forward; to look forward.
- reading group — a group of people who meet regularly to discuss a book that they have all read
- reconsolidate — to bring together (separate parts) into a single or unified whole; unite; combine: They consolidated their three companies.
- recording van — a van containing sound and image recording equipment, used as a mobile recording studio
- redesignation — an act of designating.
- redial button — a button on a telephone, allowing the user to dial a number again
- reduplication — the act of reduplicating; the state of being reduplicated.
- reinvigorated — to give vigor to; fill with life and energy; energize.
- retinoic acid — a vitamin A derivative, C20H28O2, used in the treatment of acne, skin wrinkles, etc.
- revendication — the process or act of revendicating
- revindication — the act of vindicating.
- rhodesian man — an extinct Pleistocene human whose cranial remains were found at Kabwe, in Zambia: formerly in some classifications Homo rhodesiensis but now considered archaic Homo sapiens.
- road accident — a traffic accident involving vehicles, pedestrians or cyclists
- road-blocking — an obstruction placed across a road, especially of barricades or police cars, for halting or hindering traffic, as to facilitate the capture of a pursued car or inspection for safety violations.
- robben island — a small island in South Africa, 11 km (7 miles) off the Cape Peninsula: formerly used by the South African government to house political prisoners
- robot dancing — a dance of the 1980s characterized by jerky mechanical movements
- rogation days — Usually, rogations. Ecclesiastical. solemn supplication, especially as chanted during procession on the three days (Rogation Days) before Ascension Day.
- rollerblading — skating on rollerblades
- roman holiday — a public spectacle or controversy marked by barbarism, vindictiveness, or scandal.
- romantic lead — a person who plays the main character in a romantic film or play
- rose mandarin — (in the Chinese Empire) a member of any of the nine ranks of public officials, each distinguished by a particular kind of button worn on the cap.
- rough diamond — gemstone: uncut diamond
- ruggedization — the act or process of making something rugged
- running board — a small ledge, step, or footboard, formerly beneath the doors of an automobile, to assist passengers entering or leaving the car.
- saint leonard — a city in S Quebec, in E Canada: suburb of Montreal.
- sarcodinians' — belonging or pertaining to the protist phylum Sarcodina, comprising protozoa that move and capture food by forming pseudopodia.
- scarfed joint — a lapped joint between two pieces of timber made by notching or grooving the ends and strapping, bolting, or gluing the two pieces together
- self-ordained — to invest with ministerial or sacerdotal functions; confer holy orders upon.