All articles starting with H

Hohmann transfer orbit

The Hohmann transfer orbit is an elliptical orbit connecting two coplanar circular orbits with two engine burns; Walter Hohmann described it in 1925 as the minimum-propellant transfer.

Oct 21, 2026

HOHO (Helping Ourselves, Helping Others), the Young Women's Breast Cancer Study (YWS), NCT01468246: prospective cohort of women diagnosed with breast cancer at age 40 or younger, with North American (1,302 women) and European IBCSG 43-09 (300 women) cohorts studying fertility, psychosocial, and treatment outcomes over 10 years.

Hohokam

The Hohokam was a prehistoric farming culture in central and southern Arizona from the first years A.D. to about 1450, known for vast irrigation canals.

Hohokam canal systems

The Hohokam canal systems were hand-dug prehistoric irrigation canals in southern Arizona, diverting water from the Salt and Gila rivers onto more than 100,000 acres near Phoenix.

Hoʻoponopono

Hoʻoponopono is a Native Hawaiian practice of reconciliation, traditionally a family conference led by a facilitator, adapted in 1976 by Morrnah Simeona into an individual self-help method known for four forgiveness phrases.

Hội An

Hội An (Phố cổ Hội An, Faifo) is a central Vietnam city whose UNESCO-listed Ancient Town, a 15th-19th century trading port of 1,107 timber buildings on the Thu Bon River, was inscribed in 1999 and faces major flooding.

Hội An Old Town

Hội An Old Town (Phố cổ Hội An, Hoi An Ancient Town) is a UNESCO World Heritage trading-port district in Quảng Nam, Vietnam, inscribed in 1999 under criteria (ii) and (v), with 1,107 timber buildings on 30 ha.

Hoi polloi (οἱ πολλοί)

Hoi polloi (οἱ πολλοί, "the many") is an English plural noun for the common people or masses, often derogatory. Borrowed from Ancient Greek via Dryden (1668) and Byron (1822); anglicized by 1837; "the hoi polloi" is standard despite the embedded Greek article.

Sep 21, 2026

Hoi-Kwong Lo

Hoi-Kwong Lo is a quantum information scientist and professor at the University of Toronto known for QKD security proofs, the decoy-state method, and co-inventing MDI-QKD in 2012.

Sep 21, 2026

Hoi‐Jun Yoo

Hoi-Jun Yoo (유회준) is a South Korean electrical engineer and KAIST professor since 1998 who designs low-power AI and wearable healthcare chips, including the UNPU accelerator.

Hoisin sauce (海鲜酱)

Hoisin sauce (海鲜酱, hǎixiān jiàng) is a thick, sweet-savory Cantonese condiment from Guangdong made of fermented soybeans, sugar, vinegar, garlic, and spices; despite its name meaning seafood, it contains none and stars with Peking duck, char siu, and pho.

Hoist (album)

Hoist is Phish's fifth studio album, released on Elektra in March 1994. Recorded in Los Angeles with producer Paul Fox, it featured guests Béla Fleck, Alison Krauss, Tower of Power, and Jonathan Frakes, and the single Down with Disease.

Hoist (device)

A hoist, also called a chain hoist or chainfall, is a mechanical device that lifts and lowers loads using chain or wire rope, powered by hand, motor, air, or hydraulics.

Hoist with his own petard

Hoist with his own petard, from Shakespeare's Hamlet Act III Scene IV ("petar"), is an idiom for being harmed by one's own scheme; a petard was a small breaching bomb from French péter, to break wind.

Hojakdo

Hojakdo (호작도), also called jakhodo, is a Korean painting genre depicting a tiger beneath a pine with magpies above, a Joseon folk art subject carrying protective and satirical meanings.

Hojeok beop

Hojeok beop (호적법) was the household registration law of Joseon Korea, requiring every household to be entered in census registers revised every three years so the state could levy taxes and service obligations.

Oct 21, 2026

Hoji ya Henda

Hoji ya Henda, a 2024 municipality in Luanda province, Angola, split from Cazenga by Decree 268/24 and named for MPLA commander José Mendes de Carvalho, killed in combat in 1968; also a bairro, commune, and Luanda avenue name.

Hōjicha (焙じ茶)

Hōjicha (焙じ茶, houjicha) is Japanese roasted green tea made by roasting bancha or sencha at about 170°C, giving pyrazine-based toasted aroma, low astringency, and 20 mg caffeine per 100 mL, distinct from unroasted bancha.

Hojil

Hojil (호질) is a short satirical story in classical Chinese by the late Joseon scholar Park Ji-won, part of his travel record Yeolha Ilgi, in which a tiger rebukes a hypocritical scholar.

Hōjō clan

Hōjō clan (北条氏): Japanese warrior lineage that ruled as hereditary regents (shikken) of the Kamakura shogunate from 1203 to 1333, distinct from the unrelated Later Hōjō (Go-Hōjō) daimyo of Odawara destroyed in 1590.

Hōjō Masako

Hōjō Masako (北条政子, 1157–1225), wife of the first shogun Minamoto no Yoritomo, effectively headed the Kamakura shogunate after his death, ruling behind child shoguns and rallying vassals in the Jōkyū War of 1221.

Hōjō Regency

The Hōjō Regency was the hereditary rule of the Hōjō clan as shikken, regents to the Kamakura shogunate, from 1203 until the shogunate's collapse in 1333.

Hōjō Sadatoki

Hōjō Sadatoki (北条貞時) was the ninth regent of the Kamakura shogunate, holding power from 1284 until 1301 and directing it until his death in 1311.

Hōjō Sōun

Hōjō Sōun, known in his lifetime as Ise Shinkurō Moritoki, was a Japanese warrior who seized Izu in 1493 and founded the Go-Hōjō clan of Sengoku daimyo.

Hōjō Sōun's seizure of Izu

Hōjō Sōun's seizure of Izu (北条早雲の伊豆討入り) was the 1493 campaign in which the warlord Ise Shinkurō, later Hōjō Sōun, took Izu Province from Ashikaga Chachamaru, ending with Fukane Castle's fall in 1498.

Hōjō Takatoki

Hōjō Takatoki (北条高時), 1303 to 1333, was the 14th shikken, or regent, of the Kamakura shogunate, holding office from 1316 until illness forced his retirement in 1326.

Hōjō Tokimasa

Hōjō Tokimasa (北条時政, 1138–1215) was an Izu warrior who sheltered the exiled Minamoto no Yoritomo, helped found the Kamakura shogunate, and became its first shikken (regent) from 1203 to 1205.

Hōjō Tokimune

Hōjō Tokimune (北条時宗), 1251 to 1284, was the eighth regent of the Kamakura shogunate who directed Japan's defense against the two Mongol invasions and founded Engakuji temple.

Hōjō Tokiyori

Hōjō Tokiyori (北条時頼), 1227 to 1263, was the fifth shikken of the Kamakura shogunate, who crushed the Miura clan in 1247 and installed Prince Munetaka as shogun in 1252.