12-letter words containing a, i, r, k
- reaping hook — a curved cutting tool with a sharp edge, used in the cutting or harvesting of crops
- ribbon snake — either of two long-tailed garter snakes, Thamnophis proximus or T. sauritus, of eastern and central North America, having a brownish body and yellow or orange stripes.
- ribeye steak — a large beefsteak cut from the outer, or eye, side of the ribs.
- richard korf — (person) A Professor of computer science at the University of California, Los Angeles. Richard Korf received his B.S. from MIT in 1977, and his M.S. and Ph.D. in computer science from Carnegie-Mellon University in 1980 and 1983. From 1983 to 1985 he served as Herbert M. Singer Assistant Professor of Computer Science at Columbia University. Dr. Korf studies problem-solving, heuristic search and planning in artificial intelligence. He wrote "Learning to Solve Problems by Searching for Macro-Operators" (Pitman, 1985). He serves on the editorial boards of Artificial Intelligence, and the Journal of Applied Intelligence. Dr. Korf is the recipient of several awards and is a Fellow of the American Association for Artificial Intelligence.
- rickenbacker — Edward Vernon ("Eddie") 1890–1973, U.S. aviator and aviation executive.
- rijksdaalder — a cupronickel or silver coin of the Netherlands, equal to 2½ guilders.
- risk capital — venture capital.
- risk manager — A risk manager is a person who works in risk management.
- risk-manager — the technique or profession of assessing, minimizing, and preventing accidental loss to a business, as through the use of insurance, safety measures, etc.
- rock carving — the practice of carving on rock
- rock glacier — a mass of rock resembling a valley glacier that moves or is moved down a slope by its own weight or by the action of frost and interstitial ice.
- rock jasmine — any of several alpine plants belonging to the genus Androsace, of the primrose family, having tufted leaves often in basal rosettes, and umbels of pink, red, purple, or white flowers.
- roman strike — a striking mechanism of c1700, giving the equivalent in tones of Roman numerals, a bell of one pitch striking once for each number I, a bell of another pitch striking once for V, twice for X.
- running back — an offensive back, as a halfback or fullback, whose principal role is advancing the ball by running with it on plays from scrimmage.
- safecracking — the act of breaking into a safe
- salmon brick — a soft, imperfectly fired brick having a reddish-orange color.
- sand cricket — Jerusalem cricket.
- sankt moritz — German name of St. Moritz.
- sat sri akal — a salutation used in India
- science park — A science park is an area, usually linked to a university, where there are a lot of private companies, especially ones concerned with high technology.
- scrapbooking — hobby: collaging
- scratch disk — 1. (storage) See scratch. 2. (operating system) Unallocated space on Windows 95's primary hard disk partition, used for virtual memory. Shortage of space on this partition can result in the error "scratch disk full".
- scrimshanker — a shirker
- sea milkwort — a maritime plant, Glaux maritima, having small, pinkish-white flowers.
- section mark — section (def 16).
- semidarkness — partial darkness.
- seraskierate — the headquarters of the seraskier, located in Constantinople; the Turkish War Office
- service mark — a proprietary term, such as Blue Cross and Blue Shield, American Express, or Planned Parenthood, that is registered with the Patent and Trademark Office. Abbreviation: SM.
- share-milker — (in New Zealand) a person who lives on a dairy farm milking the owner's herd for an agreed share of the profits and, usually, building his own herd simultaneously
- shirt jacket — a shirtlike jacket.
- shopbreaking — the act of breaking into a shop
- sikandarabad — Secunderabad.
- silk factory — plant where silk fabric is produced
- single track — a single pair of lines so that trains can travel in only one direction at a time
- single-track — (of a railroad or section of a railroad's route) having but one set of tracks, so that trains going in opposite directions must be scheduled to meet only at points where there are sidings.
- sitka spruce — a spruce, Picea sitchensis, of western North America, having long, silvery-white needles, grown as an ornamental.
- skating rink — arena for ice skating
- skating turn — a turn made by someone on roller or ice skates
- skirt chaser — a womanizer.
- skirt-chaser — a womanizer.
- smart cookie — intelligent or sharp-witted person
- smoking area — a designated area in which smoking is permitted
- spark-killer — a device for diminishing sparking, consisting of a capacitor and a resistor connected in series across two points where sparking may occur in a circuit.
- spring break — a vacation from school or college during the spring term, lasting about a week.
- stick around — to pierce or puncture with something pointed, as a pin, dagger, or spear; stab: to stick one's finger with a needle.
- stickhandler — a hockey or lacrosse player, esp. one who is talented at stickhandling.
- straightneck — a variety of summer squash related to the crookneck but not having a recurved neck.
- straitjacket — a garment made of strong material and designed to bind the arms, as of a violently disoriented person.
- stravinskian — of, relating to, or suggesting the composer Igor Stravinsky or his works.
- strike fault — a fault that trends parallel to the strike of the strata that it offsets.