13-letter words containing o, r, k
- howler monkey — Central American simian variety
- hydrocracking — the cracking of petroleum or the like in the presence of hydrogen.
- hydrofracking — a process in which fractures in rocks below the earth's surface are opened and widened by injecting chemicals and liquids at high pressure: used especially to extract natural gas or oil.
- hydrokinetics — the branch of hydrodynamics that deals with the laws governing liquids or gases in motion.
- hydroxyketone — a ketone containing a hydroxyl group.
- invoice clerk — a worker, esp in an office, who deals with invoices
- jack robinson — Bill ("Bojangles") 1878–1949, U.S. tap dancer.
- jerusalem oak — feather geranium.
- jockey shorts — Jockey shorts are a type of men's underpants.
- joseph hooker — Joseph, 1814–79, Union general in the U.S. Civil War.
- joyner-kersee — Jacqueline ("Jackie") born 1962, U.S. track and field athlete.
- kangaroo care — a method of caring for a premature baby in which the baby is periodically held against a parent's bare chest.
- kangaroo code — spaghetti code
- kangaroo vine — an Australian vine, Cissus antarctica, of the grape family, having shiny, leathery leaves.
- karaoke night — a social occasion when karaoke sessions are held for entertainment, often in a pub or bar
- katharometers — Plural form of katharometer.
- keep track of — monitor, maintain record of
- kennebunkport — a town in SW Maine: summer resort.
- kenneth arrow — Kenneth Joseph, born 1921, U.S. economist: Nobel Prize 1972.
- kentish glory — a moth, Endromis versicolora, common in north and central Europe, having brown variegated front wings and, in the male, orange hindwings
- keratinocytes — Plural form of keratinocyte.
- keratomycosis — Fungal infection of the cornea.
- kernel parlog — (language) A modeless intermediate language for Parlog compilation.
- kerosene lamp — light fuelled by paraffin
- killing frost — the occurrence of temperatures cold enough to kill all but the hardiest vegetation, especially the last such occurrence in spring and the first in fall, events that limit the agricultural growing season.
- kilowatt-hour — a unit of energy, equivalent to the energy transferred or expended in one hour by one kilowatt of power; approximately 1.34 horsepower-hours. Abbreviation: kWh, K.W.H., kwhr.
- kinematograph — cinematograph.
- king's ransom — an extremely large amount of money: The painting was sold for a king's ransom.
- kinross-shire — a former county of E central Scotland: became part of Tayside region in 1975 and part of Perth and Kinross in 1996
- knickerbocker — a descendant of the Dutch settlers of New York.
- know by heart — have memorized
- kolding fjord — an inlet of the Little Belt at the head of which is Kolding
- komi republic — a constituent republic of NW Russia: annexed by the princes of Moscow in the 14th century. Capital: Syktyvkar. Pop: 1 019 000 (2002). Area: 415 900 sq km (160 540 sq miles)
- komodo dragon — the largest monitor lizard, Varanus komodoensis, of Komodo and other East Indian islands: grows to a length of 3 m (about 10 ft) and a weight of 135 kilograms (about 300 lbs.)
- korf, richard — Richard Korf
- kosher pickle — a garlic-flavored pickle, sold especially in Jewish delicatessens.
- kraft process — a process for making wood pulp by digesting wood chips in an alkaline liquor consisting chiefly of caustic soda together with sodium sulfate.
- krishna menon — Vengalil Krishnan [ven-gah-leel krish-nuh n] /vɛnˈgɑ lil ˈkrɪʃ nən/ (Show IPA), 1897–1974, Indian politician and statesman.
- kyrie eleison — (italics) the brief petition “Lord, have mercy,” used in various offices of the Greek Orthodox Church and of the Roman Catholic Church.
- labour market — When you talk about the labour market, you are referring to all the people who are able to work and want jobs in a country or area, in relation to the number of jobs there are available in that country or area.
- labrador duck — an extinct sea duck, Camptorhynchus labradorius, of northern North America, having black and white plumage.
- lake maggiore — a lake in N Italy and S Switzerland, in the S Lepontine Alps
- lake sturgeon — a sturgeon, Acipenser fulvescens, of the Great Lakes and Mississippi and St. Lawrence rivers.
- lake superior — Lake, a lake in the N central United States and S Canada: the northernmost of the Great Lakes; the largest body of fresh water in the world. 350 miles (564 km) long; 31,820 sq. mi. (82,415 sq. km); greatest depth, 1290 feet (393 meters); 602 feet (183 meters) above sea level.
- lake victoria — the ancient Roman goddess of victory, identified with the Greek goddess Nike.
- lake-superior — Lake, a lake in the N central United States and S Canada: the northernmost of the Great Lakes; the largest body of fresh water in the world. 350 miles (564 km) long; 31,820 sq. mi. (82,415 sq. km); greatest depth, 1290 feet (393 meters); 602 feet (183 meters) above sea level.
- lantern clock — an English bracket clock of the late 16th and 17th centuries, having a brass case with corner columns supporting pierced crestings on the sides and front.
- leopard shark — a small, inshore shark, Triakis semifasciata, having distinctive black markings across the back, inhabiting Pacific coastal waters from Oregon through California.
- leptokurtosis — the state of being leptokurtic.
- leptokurtotic — (statistics) Leptokurtic.