15-letter words containing o, r
- allotransplants — Plural form of allotransplant.
- allotriomorphic — (of minerals) not having their own regular shape (as determined by their internal structure) but being shaped instead by adjacent minerals
- almighty dollar — money regarded as a major goal in life or as the basis of power: Love of the almighty dollar has ruined many people.
- almirante brown — a city in E Argentina, near Buenos Aires.
- alopecia areata — loss of hair in circumscribed patches.
- alpha geminorum — Castor
- alpha radiation — alpha particles emitted from a radioactive isotope
- alpine accentor — a small bird of the sparrow family, Prunella collaris, found especially in mountain regions of S Europe and Asia
- alsace-lorraine — an area of NE France, comprising the modern regions of Alsace and Lorraine: under German rule 1871–1919 and 1940–44. Area: 14 522 sq km (5607 sq miles)
- alta california — a former Spanish colony of New Spain, in the modern-day states of California, Nevada, and N Arizona: ceded by Mexico to the United States 1848.
- altar of repose — a pedestal or niche upon which the sacraments are preserved from Maundy Thursday to Good Friday.
- aluminum borate — a white, granular, water-insoluble powder, 2Al 2 O 3 ⋅B 2 O 3 ⋅3H 2 O, used chiefly in the manufacture of crown glass.
- aluminum bronze — any of several alloys containing a high percentage of copper with from 5 to 11 percent aluminum and varying amounts of iron, nickel, manganese, and other elements.
- amador guerrero — Manuel [mah-nwel] /mɑˈnwɛl/ (Show IPA), 1833–1909, Panamanian political leader: first president of Panama 1904–08.
- amaryllidaceous — of, relating to, or belonging to the Amaryllidaceae, a family of widely cultivated flowering plants having bulbs and including the amaryllis, snowdrop, narcissus, and daffodil
- ambassadorships — Plural form of ambassadorship.
- ambrose channel — a ship channel at the entrance to New York harbor, near Sandy Hook. 7½ miles (12 km) long.
- ambrosia beetle — any of various small beetles of the genera Anisandrus, Xyleborus, etc, that bore tunnels into solid wood, feeding on fungi growing in the tunnels: family Scolytidae (bark beetles)
- ambrosian chant — the liturgical chant, established by Saint Ambrose, characterized by ornamented, often antiphonal, singing.
- ambulatory care — care given at a hospital to non-resident patients, including minor surgery and outpatient treatment
- amegakaryocytic — Characterized by a lack of megakaryocytes.
- american copper — a malleable, ductile, metallic element having a characteristic reddish-brown color: used in large quantities as an electrical conductor and in the manufacture of alloys, as brass and bronze. Symbol: Cu; atomic weight: 63.54; atomic number: 29; specific gravity: 8.92 at 20°C.
- american cotton — upland cotton.
- american gothic — a painting (1930) by Grant Wood.
- american legion — an association of former member of the US armed forces
- american smooth — a style of competitive ballroom dancing which incorporates elements of Latin dance
- american wigeon — a bird of North America, Anas americana, that is similar to the wigeon; the male has a white crown
- americanization — Americanization is the process by which people or countries become more and more similar to Americans and the United States.
- americanologist — a foreign expert or specialist in American cultural or political matters: a leading Americanologist in the Kremlin.
- amphiarthrodial — a joint permitting only slight motion, as that between the vertebrae.
- amyl propionate — a colorless liquid, C 8 H 16 O 2 , having an applelike odor, used chiefly as a scent in the manufacture of flavorings and perfume.
- an axe to grind — an ulterior motive
- anacostia river — a river in the District of Columbia flowing into the Potomac River. about 24 miles (39 km) long.
- analog computer — a mechanical, electrical, or electronic computer that performs arithmetical operations by using some variable physical quantity, such as mechanical movement or voltage, to represent numbers
- analogous color — Art. any one of a group of related colors that are near each other on the color wheel, a circular chart that shows gradations of color: Red, orange, and yellow are analogous colors. Compare complementary color (def 1a).
- anamorphic lens — a component in the optical system of a film projector for converting standard 35mm film images into wide-screen format
- anchorage point — a point to which something such as the straps securing a childseat can be safely attached
- ancient history — Ancient history is the history of ancient civilizations, especially Greece and Rome.
- andrew of crete — a.d. c650–730, Greek poet and Orthodox archbishop of Crete.
- andrographolide — (organic compound) A bitter labdane diterpenoid that is the main bioactive component of the medicinal plant Andrographis paniculata, effective against certain cancers.
- andromonoecious — (of a plant species) having hermaphrodite and male flowers on the same plant
- androstenedione — a weak hormone, C19H26O2, produced by the ovaries, testes, and adrenal glands as a precursor to estrogen, testosterone, etc.: formerly taken in a concentrated tablet or capsule form as by some bodybuilders
- aneroid capsule — a box or chamber of thin metal, partially exhausted of air, used in the aneroid barometer and pressure altimeter.
- anfractuosities — Plural form of anfractuosity.
- angina pectoris — a sudden intense pain in the chest, often accompanied by feelings of suffocation, caused by momentary lack of adequate blood supply to the heart muscle
- angle of repose — the maximum angle to the horizontal at which rocks, soil, etc, will remain without sliding
- angry young man — one of several British novelists and playwrights of the 1950s who shared a hostility towards the established traditions and ruling elements of their country
- angry young men — a group of young writers in Great Britain after WWII, bitterly critical of upper-class and middle-class values, practices, etc.
- angustirostrate — having a narrow, beak-like part
- animal behavior — behavior (def 2).