9-letter words containing a, p, o
- air corps — (before July 26, 1947) a branch of the U.S. Army concerned with military aviation.
- air power — A nation's air power is the strength of its air force.
- air scoop — a device fitted to the surface of an aircraft to provide air pressure or ventilation from the airflow
- al capone — Al(phonse) ("Scarface") 1899–1947, U.S. gangster and Prohibition-era bootlegger, probably born in Italy.
- alepidote — (of a fish) not having scales.
- alley-oop — used as an exclamation accompanying the act of lifting, rising, etc.
- allocarpy — the production of fruit through cross-fertilization
- allograph — a document written by a person who is not a party to it
- allomorph — any of the phonological representations of a single morpheme. For example, the final (s) and (z) sounds of bets and beds are allomorphs of the English noun-plural morpheme
- allopathy — the orthodox medical method of treating disease, by inducing a condition different from or opposed to the cause of the disease
- allopatry — the condition of existing in areas that are geographically separated from one another; esp the condition of genetically similar species which cannot interbreed because of this geographical separation
- allophane — a variously coloured amorphous mineral consisting of hydrated aluminium silicate and occurring in cracks in some sedimentary rocks
- allophone — any of several speech sounds that are regarded as contextual or environmental variants of the same phoneme. In English the aspirated initial (p) in pot and the unaspirated (p) in spot are allophones of the phoneme /p/
- alloplasm — part of the cytoplasm that is specialized to form cilia, flagella, and similar structures
- allotrope — any of two or more physical forms in which an element can exist
- allotropy — the existence of an element in two or more physical forms. The most common elements having this property are carbon, sulphur, and phosphorus
- allotypic — relating to an allotype
- alopecoid — resembling a fox
- alpenglow — a reddish light on the summits of snow-covered mountain peaks at sunset or sunrise
- alpenhorn — a long, powerful horn of wood or bark, with a cupped mouthpiece and a curved bell at opposite ends, used by Swiss herders and mountaineers.
- alphasort — to arrange in alphabetical order
- alphonsus — a crater in the SE quadrant of the moon, about 112 km in diameter, in which volcanic activity may have occurred
- altiplano — a plateau of the Andes, covering two thirds of Bolivia and extending into S Peru: contains Lake Titicaca. Height: 3000 m (10 000 ft) to 3900 m (13 000 ft)
- ambipolar — (of plasmas and semiconductors) involving both positive and negative charge carriers
- amblyopia — impaired vision with no discernible damage to the eye or optic nerve
- amblyopic — Of, relating to, or suffering from amblyopia.
- ambrotype — an early type of glass negative that could be made to appear as a positive by backing it with black varnish or paper
- amenhotep — name of four kings of Egypt who ruled during the 16th, 15th, & 14th cent. b.c.
- ametropia — loss of ability to focus images on the retina, caused by an imperfection in the refractive function of the eye
- ametropic — relating to ametropia
- amorphism — the state or quality of being amorphous.
- amorphous — Something that is amorphous has no clear shape or structure.
- amphibole — any of a large group of minerals consisting of the silicates of calcium, iron, magnesium, sodium, and aluminium, usually in the form of long slender dark-coloured crystals. Members of the group, including hornblende, actinolite, and tremolite, are common constituents of igneous rocks
- amphiboly — ambiguity of speech, especially from uncertainty of the grammatical construction rather than of the meaning of the words, as in The Duke yet lives that Henry shall depose.
- amphigory — a piece of nonsensical writing in verse or, less commonly, prose
- amphinome — a maiden who, along with her sister Evadne, was deceived by Medea into murdering their father, Pelias.
- amphioxus — cephalochordate
- amphipods — Plural form of amphipod.
- amphitruo — a comedy (c200 b.c.) by Plautus.
- ampholyte — an amphoteric electrolyte
- amplicons — Plural form of amplicon.
- amplosome — the short or stocky type of human body shape
- amylopsin — an enzyme of the pancreatic juice that converts starch into sugar; pancreatic amylase
- anaphoral — relating to the prayer of oblation and consecration performed during Holy Communion
- anaphoras — Plural form of anaphora.
- anaphoria — (symptom) A tendency for both eyes to look upward.
- anaphoric — of or relating to anaphora
- anaptotic — (of languages) tending to become uninflected, in accordance with a theory that languages evolve from uninflected to inflected and back.
- aneuploid — (of polyploid cells or organisms) having a chromosome number that is not an exact multiple of the haploid number, caused by one chromosome set being incomplete
- angiocarp — a plant bearing an angiocarpous fruit.