13-letter words containing o, r, d, a, i
- 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.
- 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.
- 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.
- rialto bridge — a bridge over the Grand Canal in Venice, Italy, liking Rialto Island with San Marco Island
- rio da duvida — former name of Roosevelt, Río.
- 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
- rock-fill dam — a dam built mainly of rocks of various sizes fitted compactly together.
- rogation days — Usually, rogations. Ecclesiastical. solemn supplication, especially as chanted during procession on the three days (Rogation Days) before Ascension Day.
- rogue dialler — a dial-up connection placed on a computer without the user's knowledge which, when the user tries to connect to the internet, automatically connects to a premium-rate phone number
- 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.
- sacerdotalism — the system, spirit, or methods of the priesthood.
- sacerdotalize — to submit (something) to sacerdotalism
- 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
- scratch video — the technique or practice of recycling images from films or television to make collages
- self-ordained — to invest with ministerial or sacerdotal functions; confer holy orders upon.
- senza sordino — a musical direction to remove or play without the mute or (on the piano) with the sustaining pedal pressed down
- serodiagnosis — a diagnosis involving tests on blood serum or other serous fluid of the body.