12-letter words containing r, o
- aerosol bomb — a metal receptacle, containing an inert gas under pressure, that sprays an insecticide, disinfectant, or the like when the gas is released by opening a valve.
- aethrioscope — an instrument which measures temperature changes caused by different conditions of the sky
- affine group — the group of all affine transformations of a finite-dimensional vector space.
- affirmations — Plural form of affirmation.
- afforestable — having the capacity to be turned into forest
- affrontingly — in an affronting manner
- aforestation — Alternative spelling of afforestation.
- aforethought — premeditated (esp in the phrase malice aforethought)
- afrikanerdom — (in South Africa) Afrikaner nationalism based on pride in the Afrikaans language and culture, conservative Calvinism, and a sense of heritage as pioneers
- afro-asiatic — a family of languages of SW Asia and N Africa, consisting of the Semitic, ancient Egyptian, Berber, Cushitic, and Chadic subfamilies
- afro-british — of or relating to British people of African descent
- afrocentrism — centered on Africa or on African-derived cultures, as those of Brazil, Cuba, and Haiti: Afrocentric art.
- after a sort — to some extent
- after-school — After-school activities are those that are organized for children in the afternoon or evening after they have finished school.
- afterthought — If you do or say something as an afterthought, you do or say it after something else as an addition, perhaps without careful thought.
- agaricaceous — belonging to the Agaricaceae, a family of fungi including mushrooms having blade-shaped gills on the underside of the cap.
- agent orange — a highly poisonous herbicide used as a spray for defoliation and crop destruction, esp by US forces during the Vietnam War
- agglomerated — gathered together into a cluster or mass.
- agglomerates — Third-person singular simple present indicative form of agglomerate.
- agglomerator — gathered together into a cluster or mass.
- aggravations — Plural form of aggravation.
- aggregations — Plural form of aggregation.
- aggrupations — Plural form of aggrupation.
- agranulocyte — a white blood cell without granules in its cytoplasm
- agriproducts — Plural form of agriproduct.
- agrobusiness — the businesses collectively associated with the production, processing, and distribution of agricultural products.
- agrochemical — a chemical, such as a pesticide, used for agricultural purposes
- agroforester — a person who carries out agroforestry
- agroforestry — a method of farming integrating herbaceous and tree crops
- agroindustry — an activity combining agriculture and industry
- aide-memoire — An aide-memoire is something such as a list that you use to remind you of something.
- aileron roll — a roll consisting of one or more rotations, usually controlled by the use of ailerons.
- ailurophiles — Plural form of ailurophile.
- ailurophilia — a liking for cats, as by cat fanciers.
- ailurophilic — relating to ailurophilia
- ailurophobes — Plural form of ailurophobe.
- ailurophobia — an abnormal fear of cats
- ailurophobic — relating to ailurophobia
- air corridor — an air route along which aircraft are allowed to fly
- air division — an organizational unit smaller than an air force, usually composed of a headquarters and two or more wings
- air embolism — the presence in the tissues and blood of a gas, such as air or nitrogen bubbles, caused by an injection of air or, in the case of nitrogen, by an abrupt and substantial reduction in the ambient pressure
- air observer — observer (def 3).
- airbrush out — to remove evidence of (someone or something from photographs, books, or history)
- airpocalypse — (informal) The presence of dense smog in many parts of China.
- airport code — a three-letter abbreviation of the names of the world's major airports, used especially as an identifier for routing baggage.
- alcaptonuria — Alternative spelling of alkaptonuria.
- alcohol-free — (of beer or wine) containing only a trace of alcohol
- alexanderson — Ernst F. W [urnst] /ɜrnst/ (Show IPA), 1878–1975, U.S. engineer and inventor.
- algesiometer — an instrument for determining the sensitiveness of the skin to a painful stimulus.
- alkaptonuria — excessive excretion of homogentisic acid in the urine, caused by a hereditary abnormality of the metabolism of tyrosine and phenylalanine.