12-letter words containing a, h, o, l
- harbour seal — a common earless seal, Phoca vitulina, that is greyish-black with paler markings: found off the coasts of North America, N Europe, and NE Asia
- harmonic law — any one of three laws governing planetary motion: each planet revolves in an ellipse, with the sun at one focus; the line connecting a planet to the sun sweeps out equal areas in equal periods of time (law of areas) or the square of the period of revolution of each planet is proportional to the cube of the semimajor axis of the planet's orbit (harmonic law)
- harmonically — pertaining to harmony, as distinguished from melody and rhythm.
- harmoniously — marked by agreement in feeling, attitude, or action: a harmonious group.
- harmonizable — That can be harmonized.
- harold stark — Harold Raynsford [reynz-ferd] /ˈreɪnz fərd/ (Show IPA), 1880–1972, U.S. admiral.
- has no equal — If you say that someone or something has no equal, you think that there is nothing that is as good as them or that reaches the same standard.
- hazel grouse — a European woodland grouse, Tetrastes bonasia, somewhat resembling the North American ruffed grouse.
- hazelnut oil — an oil extracted from hazelnuts and used mostly in cooking
- headlongness — Headlong quality or speed; precipitateness.
- headstrongly — In a headstrong manner.
- hearing loss — diminished ability to hear
- hebdomadally — taking place, coming together, or published once every seven days; weekly: hebdomadal meetings; hebdomadal groups; hebdomadal journals.
- heel-and-toe — noting a pace, as in walking contests, in which the heel of the front foot touches ground before the toes of the rear one leave it.
- heilongjiang — a province in NE China, S of the Amur River. 108,880 sq. mi. (281,999 sq. km). Capital: Harbin.
- helicobacter — Any member of the Helicobacter bacteria.
- helicographs — Plural form of helicograph.
- heliogabalus — (Varius Avitus Bassianus"Marcus Aurelius Antoninus") a.d. 204–222, Roman emperor 218–222.
- heliographed — Simple past tense and past participle of heliograph.
- heliographer — (obsolete) Photographer.
- heliographic — a device for signaling by means of a movable mirror that reflects beams of light, especially sunlight, to a distance.
- heliogravure — photoengraving.
- heliotherapy — treatment of disease by means of sunlight.
- hellaciously — In a hellacious manner.
- hello packet — (networking, communications) An OSPF packet sent periodically on each network interface, real or virtual, to discover and test connections to neighbours. Hello packets are multicast on physical networks capable of multicasting or broadcasting to enable dynamic router discovery. They include the parameters that routers connected to a common network must agree on. Hello packets increase network resilience by, e.g., allowing a router to establish a secondary connection when a primary connection fails.
- hells canyon — a canyon on the Snake River in S Idaho and along the Oregon border: 125 miles (210 km) long with a maximum depth of about 7900 feet (2408 meters).
- hematoblasts — Plural form of hematoblast.
- hematocolpos — (medicine) A medical condition in which the vagina fills with menstrual blood, often caused by the combination of menstruation with an imperforate hymen.
- hematologist — the study of the nature, function, and diseases of the blood and of blood-forming organs.
- hemerocallis — the genus comprising the day lilies.
- hemimetaboly — Hemimetabolism.
- hemiplankton — plankton that spend part of their life cycle in a vegetative state on the sea bottom, riverbed, etc. (opposed to holoplankton).
- hemodialyses — Plural form of hemodialysis.
- hemodialysis — dialysis of the blood, especially with an artificial kidney, for the removal of waste products.
- hemodialyzer — artificial kidney.
- hemophiliacs — Plural form of hemophiliac.
- hemorrhoidal — Usually, hemorrhoids. Pathology. an abnormally enlarged vein mainly due to a persistent increase in venous pressure, occurring inside the anal sphincter of the rectum and beneath the mucous membrane (internal hemorrhoid) or outside the anal sphincter and beneath the surface of the anal skin (external hemorrhoid)
- hendecagonal — (geometry) Having eleven sides an angles; similar to a hendecagon.
- hepaticology — the scientific study of bryophyte plants known as hepatics or liverworts
- hepatomegaly — an abnormal enlargement of the liver, usually associated with liver disease or heart failure.
- hernioplasty — an operation for the repair of a hernia.
- heroicomical — blending heroic and comic elements: a heroicomic poem.
- heteroblasty — the morphological changes that occur in plants between juvenility and adulthood
- heterocercal — having an unequally divided tail, characteristic of sharks, rays, and skates.
- heterodactyl — having the first and fourth toes directed backward, and the second and third forward, as in trogons.
- heteroplasia — the replacement of normal cells by abnormal cells, as in cancer.
- heteroplasty — the repair of lesions with tissue from another individual or species.
- heterosexual — of, relating to, or exhibiting heterosexuality.
- heterosocial — relating to or denoting mixed-sex social relationships
- heterothally — the condition of being heterothallic