13-letter words containing r, a, i, s, e, o
- antiterrorism — opposed to or acting against terrorism; counterterrorist
- antiterrorist — relating to measures, policies, or organizations designed to combat terrorist activity
- aphanipterous — of or relating to the wingless insects of the order Aphaniptera
- apogeotropism — negative geotropism, as shown by plant stems
- apostrophized — Simple past tense and past participle of apostrophize.
- apostrophizes — Third-person singular simple present indicative form of apostrophize.
- apperceptions — Plural form of apperception.
- appersonation — the unconscious assumption of the personality characteristics of another, usually well known, person.
- appreciations — Plural form of appreciation.
- apprehensions — Plural form of apprehension.
- april showers — showers falling in April, generally considered a showery month
- arabian horse — one of a breed of horses, raised originally in Arabia and adjacent countries, noted for intelligence, grace, and speed.
- archaeologist — a specialist in archaeology, the scientific study of prehistoric peoples and their cultures by analysis of their artifacts, inscriptions, monuments, etc.
- archeologists — archaeology.
- archipelagoes — Plural form of archipelago.
- argentiferous — containing or bearing silver
- argilliferous — containing or yielding clay
- aristocracies — Plural form of aristocracy.
- aristolochene — (organic compound) A bicyclic sesquiterpene produced by certain fungi.
- arsenous acid — a toxic white powder, As2O3, used to make other arsenic compounds, insecticides, and preservatives; white arsenic
- arshile gorky — Arshile [ahr-sheel] /ˈɑr ʃil/ (Show IPA), (Vosdanig Adoian) 1904–48, American painter, born in Armenia.
- arteriovenous — of, relating to, or affecting an artery and a vein
- arthroscopies — Plural form of arthroscopy.
- arundinaceous — resembling a reed
- aspergillosis — a rare fungal infection, esp of the mucous membranes or lungs, caused by various species of Aspergillus
- assortatively — In an assortative way.
- astereognosis — inability to recognize objects by touch
- asteroid belt — the concentrations of asteroids that move around the sun mainly between the orbits of Mars and Jupiter
- astroparticle — (astrophysics) A subatomic particle of cosmic origin.
- aten asteroid — one of a small group of asteroids whose orbits cross that of the earth and whose semimajor axes are smaller than that of the earth.
- athenagoras i — (Aristocles Spyrou) 1886–1972, Archbishop Ecumenical of Constantinople and Ecumenical Patriarch of the Greek Orthodox Church 1948–72.
- atherogenesis — (medicine) The formation of atheromas, especially on the walls of the arteries.
- atmospherical — pertaining to, existing in, or consisting of the atmosphere: atmospheric vapors.
- atrociousness — The state of being atrocious.
- autoeroticism — the arousal and use of one's own body as a sexual object, as through masturbation
- baby primrose — a tender primrose, Primula forbesii, native to China and Burma, having white, hairy leaves and rose- or lilac-colored flowers with a yellow center.
- backing store — a computer storage device, usually a disk, that provides additional storage space for information so that it can be accessed and referred to when required and may be copied into the processor if needed
- bacteriolysin — an antibody which, when it combines with bacterial cells, causes lysis of those cells, thus destroying them
- bacteriolysis — the destruction or disintegration of bacteria
- bacterioscopy — the examination of bacteria with a microscope.
- bacteriostats — Plural form of bacteriostat.
- ballistospore — a spore, esp a fungal spore, that is forcefully ejected from its source
- balsamiferous — yielding or producing balsam
- banderilleros — Plural form of banderillero.
- basic process — Military. basic training. a soldier or airman receiving basic training.
- basidiospores — Plural form of basidiospore.
- bass-baritone — a singer or voice in the bass range with baritone qualities
- basso rilievo — bas-relief
- basso-relievo — bas-relief
- bearing sword — a large sword carried for its owner by a squire or servant because of its size.