13-letter words containing i, s, o, a
- antisudorific — an antiperspirant.
- antiterrorism — opposed to or acting against terrorism; counterterrorist
- antiterrorist — relating to measures, policies, or organizations designed to combat terrorist activity
- anything goes — If people say 'anything goes', they mean that anything people say or do is considered acceptable, and usually they mean that they do not approve of this.
- aphanipterous — of or relating to the wingless insects of the order Aphaniptera
- aphrodisiacal — having an aphrodisiac quality
- apicomplexans — Plural form of apicomplexan.
- apocatastasis — the belief that all free creatures shall experience salvation
- apocryphalist — A member of the group who supported the inclusion of the Apocrypha in the Bible.
- apogeotropism — negative geotropism, as shown by plant stems
- apokatastasis — the state of being restored or reestablished; restitution.
- apologeticism — An instance of the use of apologetics.
- apostolic age — the earliest period of Christianity, lasting through the death of the last apostle.
- apostolic see — the see of the pope regarded as the successor to Saint Peter
- apostolically — In an apostolic way.
- apostrophized — Simple past tense and past participle of apostrophize.
- apostrophizes — Third-person singular simple present indicative form of apostrophize.
- apothegmatise — to speak in apothegms
- apotheosizing — Present participle of apotheosize.
- apperceptions — Plural form of apperception.
- appersonation — the unconscious assumption of the personality characteristics of another, usually well known, person.
- appoggiaturas — Plural form of appoggiatura.
- appreciations — Plural form of appreciation.
- apprehensions — Plural form of apprehension.
- appropriators — Plural form of appropriator.
- april showers — showers falling in April, generally considered a showery month
- apron strings — If you say that someone is tied to another person's apron strings, you mean that they are controlled or influenced too much by the other person.
- arabian horse — one of a breed of horses, raised originally in Arabia and adjacent countries, noted for intelligence, grace, and speed.
- arachnivorous — Spider-eating.
- arachnoiditis — an inflammation of the arachnoid membrane
- archaeologist — a specialist in archaeology, the scientific study of prehistoric peoples and their cultures by analysis of their artifacts, inscriptions, monuments, etc.
- archbishopric — the rank, office, or jurisdiction of an archbishop
- archeologists — archaeology.
- archipelagoes — Plural form of archipelago.
- arcticologist — a person who specializes in arcticology.
- argentiferous — containing or bearing silver
- argilliferous — containing or yielding clay
- aristocracies — Plural form of aristocracy.
- aristocratism — the principles of aristocrats
- 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.
- articulations — Plural form of articulation.
- arundinaceous — resembling a reed
- as we know it — If you talk about a thing or system as we know it, you are referring to the form in which it exists now and which is familiar to most people.
- ascension day — the 40th day after Easter, when the Ascension of Christ into heaven is celebrated
- ascensiontide — the ten days from Ascension Day to the day before Whit Sunday
- ascoli piceno — a town in E central Italy, in the Marches: capital of the Roman province of Picenum; site of the massacre of all its Roman citizens in the Social War in 90 bc. Pop: 51 375 (2001)