13-letter words containing o, r, a
- aluminothermy — a process for reducing metallic oxides using finely divided aluminium powder. The mixture of aluminium and the oxide is ignited, causing the aluminium to be oxidized and the metal oxide to be reduced to the metal
- alveolar arch — the part of the upper or lower jawbone in which the teeth are set.
- amakrokokroko — a nickname for the South African Paralympic team
- amarantaceous — amaranthine
- amazon parrot — any of several tropical American green parrots of the genus Amazona, popular as pets.
- ambassadorial — Ambassadorial means belonging or relating to an ambassador.
- ambidexterous — ambidextrous
- ambimoustrous — able to use a computer mouse proficiently with either hand
- ambroise pare — Ambroise [ahn-brwaz] /ɑ̃ˈbrwaz/ (Show IPA), 1510–90, French surgeon.
- american aloe — century plant
- american bond — a brickwork bond having a course of headers between five or six courses of stretchers.
- american fork — a town in central Utah.
- amino radical — the univalent group, −NH 2 .
- aminoaciduria — the presence of amino acids in urine
- aminotriazole — a white, crystalline, soluble powder, NHNC(NH2)NCH, used for killing weeds or other undesired vegetation: a carcinogen
- ammonia water — ammonia (def 2).
- amor asteroid — one of a small group of asteroids whose orbits approach but do not cross that of the earth: named after the first such asteroid discovered (1932).
- amorphousness — lacking definite form; having no specific shape; formless: the amorphous clouds.
- amphiprostyle — (esp of a classical temple) having a set of columns at both ends but not at the sides
- amphitrichous — having a single flagellum at each end.
- amphitryon 38 — a play (1938) by Jean Giraudoux.
- amphotericins — Plural form of amphotericin.
- amplificatory — of the nature of enlargement or extension, as of a statement, narrative, etc.
- anachronistic — You say that something is anachronistic when you think that it is out of date or old-fashioned.
- anachronously — in an anachronous manner
- anaerobically — (of an organism or tissue) living in the absence of air or free oxygen.
- anaphorically — referring back to or substituting for a preceding word or group of words: anaphoric reference.
- anaphrodisiac — tending to lessen sexual desire
- anchor pocket — a recess in the bow of a vessel, for housing a stockless anchor.
- anchorpersons — Plural form of anchorperson.
- andean condor — either of two large, New World vultures of the family Cathartidae, Gymnogyps californianus (California condor) or Vultur gryphus (Andean condor) the largest flying birds in the Western Hemisphere: the California condor is almost extinct; the Andean condor is greatly reduced in number and rare in many areas.
- andersen nexo — Nexö, Martin Andersen.
- andersonville — town in SW central Ga.: site of a Confederate prison in the Civil War
- andrei markov — (person) 1856-1922. The Russian mathematician, after who Markov chains were named.
- androcentrism — centered on, emphasizing, or dominated by males or masculine interests: an androcentric society; an androcentric religion.
- androdioecism — the state of being androdioecious
- androgynously — In an androgynous manner.
- anfractuosity — the condition or quality of being anfractuous
- angiokeratoma — a skin disease characterized by clusters of dilated blood vessels and by thickened skin, forming warty growths, especially on the scrotum, fingers, and toes.
- angiosarcomas — Plural form of angiosarcoma.
- angiospermous — of or relating to an angiosperm; having enclosed seeds.
- angle of roll — the acute angle between the lateral axis of an aircraft or spacecraft and a horizontal plane.
- angora rabbit — a breed of rabbit with long usually white silky hair
- Ångstrom unit — a unit of length equal to 10 −10 metre, used principally to express the wavelengths of electromagnetic radiations. It is equivalent to 0.1 nanometre
- angular house — any of the four astrological houses that begin at the angles: the first, fourth, seventh, and tenth houses, that correspond, respectively, to self, home, others, and career.
- anharmonicity — (mechanics) Of or pertaining to the deviation of a system from harmonicity (being a harmonic oscillator).
- animadversion — criticism or censure
- anise camphor — anethole.
- anisometropia — an imbalance in the power of the two eyes to refract light
- anisometropic — relating to anisometropia