11-letter words containing o, r, a, i
- areocentric — relating to a reference system which has Mars as its centre
- areographic — relating to areography
- aristocracy — The aristocracy is a class of people in some countries who have a high social rank and special titles.
- aristocrats — Plural form of aristocrat.
- aristoteles — a walled plain in the first quadrant of the face of the moon: about 60 miles (97 km) in diameter.
- arkeologist — Someone who studies the story of Noah's Ark, particularly by searching for physical evidence which would corroborate it.
- arms akimbo — with hands on hips and elbows projecting outwards
- aroint thee — away! begone!
- arolla pine — a five-needled pine tree, Pinus cembra, found esp in mountain regions of Central Europe and yielding edible seeds
- aromaticity — the property of certain planar cyclic conjugated molecules, esp benzene, of behaving like unsaturated molecules and undergoing substitution reactions rather than addition as a result of delocalization of electrons in the ring
- aromatizing — Present participle of aromatize.
- arrestation — the slowing or stopping of the development or progress of something
- ars poetica — the art of poetry
- arsonphobia — Pyrophobia.
- art history — study of art through the ages
- arteriogram — an X-ray of a vein or artery which has been injected with dye in order to diagnose obstruction or damage
- arteriotomy — the surgical cutting of an artery or a cut made in an artery
- arthrodesis — the fusion of bones in a joint through surgery which causes immobility of the joint
- articulator — a person or thing that articulates
- artiodactyl — any placental mammal of the order Artiodactyla, having hooves with an even number of toes; an even-toed ungulate. The order includes pigs, hippopotamuses, camels, deer, cattle, and antelopes
- artophorion — pyx (def 1a).
- arytenoidal — relating to the arytenoid cartilages in the larynx and also to other parts relating to them
- asbestiform — having the look or structure of asbestos
- ascriptions — Plural form of ascription.
- asperations — Plural form of asperation.
- aspergation — the action of sprinkling, suffusing or irrigating with water
- aspersorium — a basin containing holy water with which worshippers sprinkle themselves
- asphyxiator — to produce asphyxia in.
- aspirations — a strong desire, longing, or aim; ambition: intellectual aspirations.
- asportation — the removal or taking away of something
- assertation — An assertion, statement of opinion.
- assessorial — a person who makes assessments, especially for purposes of taxation.
- assimilator — to take in and incorporate as one's own; absorb: He assimilated many new experiences on his European trip.
- associators — Plural form of associator.
- assortative — Denoting or involving the preferential mating of animals or marrying of people with similar characteristics.
- assyriology — the study of the culture, history, and archaeological remains of ancient Assyria
- asteroidean — an echinoderm of the class Asteroidea, comprising the starfishes.
- astraphobia — a fear of thunder and lightning
- astrogation — (in science fiction) navigation in outer space.
- astrologian — (obsolete) An astrologer.
- astrologist — the study that assumes and attempts to interpret the influence of the heavenly bodies on human affairs.
- astrometric — (astronomy) of or relating to astrometry.
- astronautic — Of or pertaining to astronautics.
- astronomize — to practise or study astronomy or engage in astronomical matters
- astrophobia — A fear of stars and celestial space.
- atherogenic — causing atheroma
- atmospheric — Atmospheric is used to describe something which relates to the Earth's atmosphere.
- atomtronics — (physics) The design, manufacture and study of analogs of electronics using atoms (especially Bose-Einstein condensates) at low temperature.
- atrabilious — irritable
- atriopeptin — any of several peptide hormones that are released by the atria of the heart in response to an abnormal increase in blood volume and that modulate blood pressure and the excretion of sodium, potassium, and water. Abbreviation: ANF.