519,064 articles
Aporia (πορία)
Aporia (ἀπορία), from aporos "without passage", is a philosophical impasse or puzzlement; central to Socrates' method, productive for Aristotle, and revived by Derrida in deconstruction.
Aporrhaidae
Aporrhaidae, pelican's-foot snails, a family of marine stromboidean gastropods with an expanded, digitate apertural lip; diverse from the mid-Jurassic, decimated at the Maastrichtian, now six species in two genera.
Aposematism
Aposematism, or warning coloration: prey advertise toxicity or unpalatability to predators via conspicuous signals. Originated with Wallace (1867), named by Poulton (1890); underlies Müllerian and Batesian mimicry.
Apostasia
Apostasia is a genus of terrestrial orchids in Apostasioideae, with Neuwiedia one of only two genera sister to all other orchids; eight species from tropical Asia to northern Australia, with powdery pollen, actinomorphic non-resupinate flowers, and cricket-dispersed seeds.
Apostasy
Apostasy is the total rejection of one's religion by a former believer, called ridda in Islam; several countries criminalize it, in some cases on pain of death.
Apostichopus japonicus
Apostichopus japonicus, the Japanese spiky sea cucumber (formerly Stichopus japonicus), a temperate Northwest Pacific sea cucumber, IUCN Endangered, the world's most economically important sea cucumber and the basis of China's large aquaculture industry.
Apostille Convention
The Apostille Convention (1961 Hague Convention Abolishing the Requirement of Legalisation for Foreign Public Documents) replaces multi-step consular legalization with a single Apostille certificate; 130 Contracting Parties, in force since 24 January 1965.
Apostle
An apostle, from Greek apostolos, is one sent with a sender's authority, the title the early Church gave leaders such as the Twelve and Paul.
Apostle (film)
Apostle (2018) is a Netflix folk horror film directed, written, and edited by Gareth Evans, his first English-language feature after The Raid films. Set in 1905, it stars Dan Stevens as a man infiltrating an island cult to rescue his sister; 79% on Rotten Tomatoes.
Apostles in the New Testament
The apostles in the New Testament are people sent out with a commission, chiefly the Twelve chosen by Jesus, along with Paul, Barnabas, and other missionaries.
Apostles' Creed
The Apostles' Creed, also called the Symbol of the Apostles, is a Western Christian confession of faith in twelve articles, rooted in the baptismal profession of the church of Rome.
Apostol Margarit
Apostol Mărgărit (born 1832 or 1836, died 1903) was an Aromanian pedagogue who led Romanian-language schools in Ottoman Macedonia and joined the Romanian Academy in 1889.
Apostolic Fathers
The Apostolic Fathers are the earliest extant Christian writings outside the New Testament, Greek works from the late first and early second centuries whose authors knew the apostles' teaching.
Apostolic nunciature
An apostolic nunciature is the Holy See's permanent diplomatic mission in a state, headed by an apostolic nuncio, the pope's ambassador, who represents the pontiff to both the government and the local Catholic hierarchy, with precedence as dean of the diplomatic corps in many Catholic countries.
Apostolic Nunciature to Germany
The Apostolic Nunciature to Germany is the Holy See's diplomatic mission to Germany, headed since 2026 by Archbishop Hubertus van Megen and established in 1920 with Eugenio Pacelli as first nuncio.
Apostolic Palace
The Apostolic Palace, also called the Vatican Palace, is the pope's official residence in Vatican City, housing the Sistine Chapel, the Raphael Rooms, and the Borgia Apartment.
Apostolic succession
Apostolic succession is the Christian doctrine that church ministry derives from the apostles through an unbroken line of bishops, required by Catholic and Orthodox churches.
Apostolic United Brethren
Apostolic United Brethren (AUB), also called the Allred group, The Work, or The Group: a Mormon fundamentalist denomination practicing plural marriage, led by Rulon C. Allred from 1954, headquartered in Bluffdale, Utah, with about 7,500 members.
Apostolic vicariate
An apostolic vicariate (Vicariat Apostolic) is a Roman Catholic territorial jurisdiction in mission regions, governed by an apostolic vicar in the Pope's name rather than a diocesan bishop.
Apostolos Georgopoulos
Apostolos P. Georgopoulos is a neuroscientist and Regents Professor at the University of Minnesota, known for population-vector analyses of movement planning and MEG biomarkers of brain disease.
Apostolos Tzitzikostas
Apostolos Tzitzikostas is a Greek politician serving as European Commissioner for Sustainable Transport and Tourism since 2024, formerly Regional Governor of Central Macedonia and President of the European Committee of the Regions.
Apostrophe
The apostrophe is a punctuation mark used in English chiefly to show possession, as in the cat's meow, and to mark omitted letters in contractions, as in don't.
Apostrophe (')
The apostrophe (') is an English punctuation mark for contractions and possessives, not plurals. Guides differ on names ending in s (Styles's vs Styles'); Unicode distinguishes U+0027, U+2019, and U+02BC.
Apothecaries' system
The apothecaries' system is a historical weight system used by pharmacists and physicians for compounding medicines, based on the grain, scruple, dram, ounce, and pound, with distinctive symbols surviving in prescriptions into the twentieth century.
Apothecary
Apothecary: a historical maker and seller of medicines, from Greek apothēkē (storehouse) via Old French apotecaire. Originally grocers' guild traders in spices and drugs; the 1617 London Society of Apothecaries and the 1815 Apothecaries Act shaped its evolution into the modern pharmacist and general practitioner.
Apothecary (film)
Apothecary (അപ്പോത്തിക്കിരി) is a 2014 Malayalam medical thriller directed by Madhav Ramadasan, starring Suresh Gopi as a neurosurgeon forced into unethical drug trials, with Jayasurya, Asif Ali, and Abhirami; released 7 August 2014.
Apothecary garden
Apothecary garden: a medicinal-plant garden for training apothecaries, also called a physic garden. Descends from monastery herb gardens; the Chelsea Physic Garden (1673) is the leading example, with later ones in Moscow, Minsk, and Antwerp.
Apotheosis
Apotheosis (Ἀποθέωσις), also called divinization, is the act of granting a mortal the rank of a deity, best known from the deification of deceased Roman emperors.
Apotropaic magic
Apotropaic magic is protective magic intended to turn away harm or evil, using amulets, gorgoneia, garlic, incantation bowls, charms, and building marks, documented from Mesopotamia and Egypt through Greco-Roman, Byzantine, and early modern Europe.
Apovitellenin I
Apovitellenin I (Apovitellenin-1, apoVLDL-II, UniProt P02659) is a chicken egg-yolk apolipoprotein identical to plasma apoVLDL-II; an estrogen-induced, liver-made, disulfide-linked 9.5-kDa homodimer that inhibits lipoprotein lipase during yolk VLDL deposition.