11-letter words containing a, r, s, o
- apatosaurus — brontosaurus
- apgar score — system for determining the condition of an infant at birth
- aphrodisiac — An aphrodisiac is a food, drink, or drug which is said to make people want to have sex.
- aplanospore — a nonmotile asexual spore produced by certain algae and fungi
- apollinaris — an effervescent mineral water
- aponeuroses — Plural form of aponeurosis.
- aponeurosis — a white fibrous sheet of tissue by which certain muscles are attached to bones
- apoproteins — Plural form of apoprotein.
- apostlebird — an omnivorous bird, Struthidea cinerea, of eastern Australia, that has chiefly dark gray-brown plumage with white tail markings and is noted for its habit of traveling in groups of about 12 related individuals.
- apostrophes — Plural form of apostrophe.
- apostrophic — a digression in the form of an address to someone not present, or to a personified object or idea, as “O Death, where is thy sting?”.
- apostrophus — a symbol resembling a reversed letter C used in Roman numerals to denote large numbers
- apotropaism — the use of ritual or magic to ward off evil or bad luck
- 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.
- apron stage — a stage that projects into the auditorium so that the audience sit on three sides of it
- 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.
- arboraceous — resembling a tree
- arborescent — having the shape or characteristics of a tree
- 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.
- archdeacons — Plural form of archdeacon.
- 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
- arduousness — requiring great exertion; laborious; difficult: an arduous undertaking.
- 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.
- armageddons — Plural form of armageddon.
- armory show — an international art show held in a New York City armory in 1913: considered a landmark in the public and critical acceptance of modern art.
- arms akimbo — with hands on hips and elbows projecting outwards
- aron kodesh — Holy Ark.
- arrestation — the slowing or stopping of the development or progress of something
- ars poetica — the art of poetry
- arse around — If you say that someone is arsing around or arsing about, you mean that they are behaving in a silly, irritating way instead of getting something done.
- arsonphobia — Pyrophobia.