#hero
- Academus — A legendary hero from ancient Attic mythology, whose primary historical and cultural significance derives from his connection to the origins of Western education. Academos owned an estate and a sacred olive grove (located northwest of Athens) where, according to myth, he helped the Dioscuri rescue Helen. This sacred grove, named 'Hekademeia' or 'Akademeia' in his honor, was later chosen by the philosopher Plato in 387 BC as the site for his famous school, transforming the hero's name into the universal etymological root for 'academy' and 'academic'.
- Acamas — The name borne by several heroes in Greek mythology, the most famous being the son of Theseus and Phaedra, mentioned in the epic cycles related to the Trojan War. He distinguished himself as an emissary sent to Troy to demand the return of Helen and as one of the brave warriors who hid inside the Trojan Horse. Broadly, the name also refers to other mythological figures, such as a Thracian leader killed in battle or a Theban warrior in the Seven against Thebes war.
- Acarnan — A Greek mythological hero, one of the Epigoni, and the son of the seer Alcmaeon and the nymph Callirhoe (daughter of the river god Achelous). According to legend, Zeus miraculously accelerated his and his brother Amphoterus's growth so they could avenge their murdered father. He later migrated to the western coast of central Greece, where he founded the ancient state and region named after him: Acarnania.
- Acastus — A Greek mythological hero and king of Iolcus, son of Pelias and Anaxibia. He participated in the famous Argonauts' expedition in search of the Golden Fleece (going against his father's will) and took part in the Calydonian Boar hunt. Following his father's murder instigated by Medea, Acast ascended the throne, expelled Jason and Medea, and organized grand funeral games, a legendary episode widely celebrated in ancient poetry and art.
- Acastus — The Latinate and international variant of the name of the Greek mythological hero Acast, son of King Pelias of Iolcus. As a legendary figure, Acastus is celebrated for his participation in the Argonauts' expedition for the Golden Fleece and the Calydonian Boar hunt, later ascending the throne and becoming entangled in dramatic conflicts with Peleus and Jason as recorded by Ovid and Apollonius of Rhodes.
- Acronte — A proper name of ancient origin borne by characters in classical mythology or major epics of world literature. The most notable is Acronte (or Acheron), a figure mentioned in Virgil's Aeneid, representing a Trojan warrior of exceptional physical strength killed in battle by Mezentius, his name being etymologically closely linked to the dark connotations of the infernal river in Greek mythology.
- Adromischus marianae — An extremely variable and highly prized dwarf perennial succulent plant species within the Crassulaceae family, endemic to the Namaqualand region of South Africa. Characterized by its very slow growth rate and unique, rough, warty, or heavily textured leaves, it often mimics dried raisins or rocky coral structures. The species encompasses numerous globally famous forms and cultivars (such as 'herrei', 'hallii', or 'Little Spheroid'), whose coloration ranges spectacularly from lime green to brick red and deep purple depending on sun exposure.
- Aeneas — Aeneas; a famous Trojan hero, son of the goddess Aphrodite (Venus) and the mortal Anchises, a central character in Homer's Iliad and the protagonist of Virgil's epic poem, the Aeneid. After the fall of Troy, he sailed to Italy, becoming according to legend the mythical ancestor of the Romans and founder of the dynasty from which Romulus and Remus would descend.
- Aepytus — Aepytus; the name borne by several characters in Greek mythology, the most famous being the mythical king of Arcadia, son of Elatus, mentioned by Homer in the Iliad. Another prominent figure with this name is the son of Cresphontes and Merope, who avenged his father's death and reclaimed the throne of Messenia, becoming the founder of the Aepytid dynasty.
- Agami bird — A medium-sized tropical bird native to the equatorial rainforests of South America, characterized by long legs, a slender neck, and spectacular plumage with metallic green, bluish, and purple iridescence. Also known as the trumpeter bird due to its loud, resonant calls, it lives in flocks on the floor of humid forests, is easily domesticated, and is sometimes used by locals to guard poultry.
- Agathyrsus — A member of an ancient tribe of Scythian or Thracian lineage (the Agathyrsi), mentioned by the historian Herodotus as inhabiting present-day Transylvania during the 5th century BC, along the upper course of the Mureș River. Structurally, this ancient population was distinguished by its wealth in gold resources, the practice of ritualistic body tattooing as a sign of nobility, and the possession of versified laws transmitted orally.
- Agathyrsi — An ancient population of Scythian or Thracian stock that inhabited the current territory of Transylvania, along the Mureș river valley, during the first millennium BC. Historically mentioned by Herodotus, they were renowned for their wealth in gold, their custom of tattooing their bodies and hair with blue designs as a sign of nobility, and for their laws transmitted orally in the form of chanted verses.
- Acheron — A river in the Epirus region of northwestern Greece, famous in Greco-Roman mythology as one of the five rivers of the underworld (Hades). Known as the 'River of Woe' or sorrow, its dark waters were believed to be where Charon ferried the souls of the deceased to the realm of shades, with its name often used as a poetic metaphor for death, perdition, or hell.
- Acheron — An old literary, archaic, or neologistic form, derived via Italian or French, used to designate the mythological river Acheron of the Underworld; a personification of the subterranean world or hell in classical and romantic poetry. This mythological toponym suggests the realm of shades and eternal suffering, used to create a somber and solemn atmosphere.
- Aherontic — Pertaining to or relating to the mythological river Acheron or the Underworld; having a spectral, lugubrious, somber, or infernal character. In literary criticism and aesthetics, the term describes an atmosphere of deep darkness, a work marked by macabre themes, heavy melancholy, or suggestions of death and the afterlife.
- Allosaurus — A genus of large bipedal theropod dinosaur, carnivorous, that lived during the Late Jurassic period (approximately 155 to 145 million years ago), operating as the apex predator in what is now North America (Morrison Formation). It was characterized by a massive skull equipped with dozens of sharp, serrated teeth, short but powerful forelimbs ending in three fingers with large claws, and a long, heavy tail used for balance.
- Allocrine — A term describing a gland, tissue, or secretion mechanism in which the produced biochemical substances are released outside the organism or toward another individual of the same or a different species, acting as external chemical messengers (such as pheromones or allomones). In a structural sense, it defines inter-organism exocrine chemical communication processes, opposed to classical endocrine or paracrine systems.
- Allosaur — A large bipedal carnivorous dinosaur from the order Saurischia (genus Allosaurus) that lived during the Late Jurassic period. This top structural predator was characterized by a massive skull equipped with serrated, sharp teeth, powerful hind limbs, and relatively short forelimbs provided with three sharp claws, being one of the most studied fossil reptiles.
- Allosaur — An alternative spelling form or Romanian phonetic variant for allosaur; a large bipedal carnivorous dinosaur from the order Saurischia (genus Allosaurus) that dominated terrestrial ecosystems during the Late Jurassic period. This predator was structurally characterized by a massive skull equipped with long, serrated teeth, muscular hind limbs, and forelimbs provided with curved, sharp claws.
- Amphiaraus — A Romanianized form or graphical variant for Amphiaraos (Amphiaraus), a legendary character in Greek mythology, king of Argos, healer, and renowned seer, counted among the Seven against Thebes. From a mythological perspective, he was venerated as a chthonic oracle hero, after the earth structurally split open under Zeus's thunderbolt and swallowed him along with his chariot to save him from a dishonorable death.