12-letter words containing a, r, o
- aortic valve — a semilunar valve between the aorta and the left ventricle of the heart that prevents the blood from flowing back into the left ventricle.
- aortographic — relating to an aortography or aortography
- apeirophobia — The fear of infinity and/or of infinite things.
- aperiodicity — not periodic; irregular.
- aphoristical — Alternative form of aphoristic.
- aphrodisiacs — Plural form of aphrodisiac.
- aplacophoran — solenogaster.
- apochromatic — (of a lens) almost free from spherical and chromatic aberration
- apocryphally — In an apocryphal manner.
- apostle bird — a gregarious grey-and-brown Australian nest-building bird, Struthidea cinerea
- apostrophise — to address by apostrophe.
- apostrophize — to address an apostrophe to
- apothecaries — Plural form of apothecary.
- apparitional — of or relating to an apparition or apparitions; ghostly, spectral
- appeal court — An appeal court is the same as a Court of Appeal.
- apperception — the attainment of full awareness of a sensation or idea
- appleknocker — Northern U.S. a rustic.
- appoggiatura — an ornament consisting of a nonharmonic note (short or long) preceding a harmonic one either before or on the stress
- apportioning — Present participle of apportion.
- appreciation — Appreciation of something is the recognition and enjoyment of its good qualities.
- appreciators — to be grateful or thankful for: They appreciated his thoughtfulness.
- appreciatory — appreciative.
- apprehension — Apprehension is a feeling of fear that something bad may happen.
- appressorium — a flattened hypha of a parasitic fungus that penetrates the host tissues
- approachable — If you describe someone as approachable, you think that they are friendly and easy to talk to.
- approachment — (archaic) approach.
- approbations — approval; commendation.
- appropriable — that can be appropriated
- appropriated — suitable or fitting for a particular purpose, person, occasion, etc.: an appropriate example; an appropriate dress.
- appropriates — suitable or fitting for a particular purpose, person, occasion, etc.: an appropriate example; an appropriate dress.
- appropriator — suitable or fitting for a particular purpose, person, occasion, etc.: an appropriate example; an appropriate dress.
- approximated — near or approaching a certain state, condition, goal, or standard.
- approximates — near or approaching a certain state, condition, goal, or standard.
- approximator — Something that approximates.
- apricot tart — a pastry case filled with apricots
- apron string — a string for tying an apron on
- arachnophobe — a person who is afraid of spiders
- araeosystyle — (of columned buildings) having an alternately very wide and very narrow intercolumniation
- araneomorphs — Plural form of araneomorph.
- arapaho peak — a mountain in N Colorado, in the Front Range of the Rocky Mountains W of Boulder. 13,506 feet (4119 meters).
- arba kanfoth — a rectangular piece of cloth with fringes at the four corners and a hole in the center for the head, worn under the clothes by Orthodox Jewish males.
- arbitrations — Plural form of arbitration.
- arborescence — treelike in size and form.
- arborio rice — variety of round-grain rice used for making risotto
- arborization — a branching treelike appearance in certain fossils and minerals
- arc cosecant — the angle, measured in radians, that has a cosecant equal to a given number. Symbol: csc −1. Abbreviation: arc csc;
- arch support — a rigid support placed inside a shoe so that its molded form fits the arch of the foot and relieves strain on the muscles of the foot while walking, standing, etc.
- archaeologic — Pertaining to archaeology.
- archaeometry — the use of science and modern technology in archaeology to examine and interpret archaeological remains
- archaic homo — collectively, the very robust, regionally differentiated human populations that lived in Europe, Asia, the Middle East, and Africa from 35,000 to 200,000 years ago.