11-letter words containing o, r, s, i
- apparations — Plural form of apparation.
- apparitions — Plural form of apparition.
- applicators — Plural form of applicator.
- appressoria — a flattened and thickened tip of a hyphal branch, formed by some parasitic fungi, that facilitates penetration of the host plant.
- aprioristic — belief in, or reliance upon, a priori reasoning, arguments, or principles.
- aqua fortis — nitric acid
- aquaerobics — A form of aerobics done while in water.
- aquafortist — a person who makes engravings or etchings through the use of aqua fortis
- arabidopsis — Any cress (or related plant) of the genus Arabidopsis.
- arabinoside — a glycoside yielding arabinose when hydrolysed
- arachis oil — peanut oil.
- araliaceous — of, relating to, or belonging to the Araliaceae, a chiefly tropical family of trees, shrubs, or woody climbers having small clusters of whitish or greenish flowers. The family includes the ivy and ginseng
- arbitrators — Plural form of arbitrator.
- arborvitaes — Plural form of arborvitae.
- arboviruses — Plural form of arbovirus.
- archaeornis — an extinct primitive Jurassic bird, formerly placed in the genus Archaeornis but now thought to be a species of archaeopteryx
- archbishops — Plural form of archbishop.
- archdiocese — An archdiocese is the area over which an archbishop has control.
- archilochus — 7th century bc, Greek poet of Paros, notable for using his own experience as subject matter
- arenicolous — growing or living in sand or sandy places
- 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
- 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
- arthrodesis — the fusion of bones in a joint through surgery which causes immobility of the joint
- 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.