All articles starting with H

Hyptis

Hyptis (Jacq., 1787) is a conserved Lamiaceae genus of 169 accepted species native to tropical and subtropical America, introduced across Africa and Asia; aromatic, terpene-rich, including H. suaveolens and H. capitata, the type species.

Hypusine

Hypusine, a modified lysine amino acid made from spermidine, occurs only in the translation factor eIF5A, whose activity in protein synthesis it enables; it was discovered in 1971.

HyQ

HyQ, short for Hydraulic Quadruped, is a fully torque-controlled, hydraulically actuated quadruped robot developed since 2007 at the Istituto Italiano di Tecnologia in Genoa, Italy, for rough terrain and dynamic tasks.

Hyracotherium

Hyracotherium, formerly Eohippus, the dawn horse, is an early Eocene small perissodactyl (55–45 Ma) from North America and Europe, 30–60 cm tall, 5–35 kg, four-toed in front, once classed as the first horse but now excluded from the horse lineage.

Hyrax

Hyrax (Hyracoidea, dassies): small rodent-like African and Middle Eastern mammals whose closest relatives are elephants and manatees; rock hyrax Procavia capensis lives in colonies on kopjes, builds middens, Least Concern.

Hyrcanian Forests

Hyrcanian Forests: ancient temperate deciduous forest belt along the southern Caspian coast in Azerbaijan and Iran, a UNESCO World Heritage site (2019, extended 2023) with over 3,200 vascular plants, Arcto-Tertiary relict trees, and rising wildfire and grazing pressures.

Hyrcanian plain

The Hyrcanian plain was a fertile plain of ancient Lydia in the valley of the Hermus river, named for a colony of Hyrcanians settled there by the Persians.

Hyrcanis (Lydia)

Hyrcanis was an ancient town of inland Lydia in western Asia Minor, lying in the Hyrcanian plain west of Sardis in modern Turkey, named by Strabo for Hyrcanian colonists settled by the Persians.

Hyrcanus (Tobiad)

Hyrcanus, son of Joseph the Tobiad, was a Jewish magnate who ruled east of the Jordan and built the estate at 'Iraq al-Amir in modern Jordan.

Hyria (Naxos)

Hyria (Yria, Iria; Ύρια), ancient sanctuary of Dionysus at Livadi near Naxos Town, Greece, in use from the 14th century BC to the Roman period; its four successive temples, especially the marble temple begun around 580 BC, document the earliest Ionic marble architecture.

Hyriidae

Hyriidae: a family of about 90 freshwater mussel species (Unionida, Hyrioidea) with a disjunct Gondwanan distribution in Australasia and South America; Cretaceous origin, glochidia larvae parasitic on fish hosts such as Gobiomorphus.

Hyrkania/Kastellion

Hyrkania, also Kastellion or Khirbet el-Mird, is a Judean Desert hilltop site: a Second Temple period fortress reused as a Byzantine monastery founded by Sabas in 492 CE, with mosaics, cisterns, and Aramaic, Greek, and Arabic papyri.

Sep 21, 2026

Hyron Spinrad

Hyron Spinrad (1934–2015) was an American astronomer and UC Berkeley professor who detected water vapor on Mars in 1963 and pushed galaxy redshift records to the edge of the observable Universe.

Hyrox

Hyrox (HYROX) is a standardized indoor fitness race founded in Hamburg in 2017 by Christian Toetzke and Moritz Fürste: eight 1 km runs alternating with eight fixed workout stations, in Open, Pro, Doubles, and Relay divisions.

Hyrule Warriors

Hyrule Warriors: Koei Tecmo-Nintendo musou series blending The Legend of Zelda with Dynasty Warriors combat. Entries: 2014 Wii U original (over 1 million sold), Definitive Edition 2018, Age of Calamity 2020, Age of Imprisonment 2025, a canon Tears of the Kingdom prequel.

Hyrule Warriors: Age of Calamity

Hyrule Warriors: Age of Calamity is a Koei Tecmo/Nintendo Switch musou hack-and-slash (Nov 20, 2020), a prequel set 100 years before Breath of the Wild with uncanonical twists; 4 million shipped, 79/100 critics, Switch 2 Definitive Edition due 2027.

Hyrule Warriors: Age of Imprisonment

Hyrule Warriors: Age of Imprisonment (ゼルダ無双封印戦記) is a canon Switch 2 musou game by Koei Tecmo and Nintendo, released 6 November 2025, dramatizing the Imprisoning War from Tears of the Kingdom; over 1 million copies shipped.

Hyrum Cook

Hyrum Cook, born in 1993, is a British entrepreneur who founded the Manchester activewear brand Adanola in 2015 and led it as chief executive until 2024.

Hyrum Smith

Hyrum Smith (1800–1844), older brother of Joseph Smith Jr., was an Eight Witness of the Book of Mormon, counselor in the First Presidency, Patriarch to the Church, and Assistant President, martyred with Joseph at Carthage Jail on June 27, 1844.

HysetCo

HysetCo is a French hydrogen-mobility startup, formed in 2019 by Air Liquide, Idex, STEP, and Toyota, that runs hydrogen stations in Paris and leases hydrogen taxis.

HyShot

HyShot was an international scramjet flight-test program led by the University of Queensland. This program achieved the world's first flight test of supersonic combustion at Woomera in 2002.

Hysiai (Greece)

Hysiai (Ὑσίαι): name of two ancient Greek frontier towns, an Argive border citadel destroyed by Sparta in 417 BC, site of the battle of Hysiae of 669–668 BC per Pausanias, and a Boeotian town on Mt. Cithaeron contested by Thebes, Athens, and Plataea.

Sep 23, 2026

Hyspaosines

Hyspaosines (هیسپاوسین) was king of Characene, a small kingdom at the head of the Persian Gulf, ruling from about 127 BC until his death in 124 BC.

Hyssaldomus

Hyssaldomos, also spelled Hyssaldomus, was a Carian dynast of Mylasa in the early 4th century BC, father of Hecatomnus and grandfather of Mausolus, known from inscriptions and small silver coins.

Hyssopus officinalis

Hyssopus officinalis (hyssop), Mediterranean mint-family herb with blue-violet flowers; culinary flavoring and Chartreuse ingredient; pinocamphone-containing essential oil is convulsant; one asthma trial.

Hyster (forklift brand)

Hyster is an American brand of forklifts, container handlers, and other lift trucks, originating in the 1929 Pacific Northwest lumber industry and now owned by Hyster-Yale Materials Handling.

Hysterectomy

Hysterectomy: surgical removal of the uterus, ending fertility and menstruation. Types include total, subtotal, and radical; routes are vaginal, abdominal, laparoscopic, robotic, and V-NOTES; fibroids are the leading indication.

Hysteresis

Hysteresis is the dependence of a material's state on its history, seen when a ferromagnet's magnetization lags the applied field and traces a closed hysteresis loop.