12-letter words containing a, l, h, m
- hammer drill — a rock drill operated by compressed air in which the boring bit is not attached to the reciprocating piston
- harlem river — tidal river separating Manhattan Island from the Bronx &, with Spuyten Duyvil Creek, connecting the East River with the Hudson: c. 8 mi (12.9 km)
- harmlessness — The characteristic of being harmless; the absence of harm.
- 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.
- haulage firm — a firm that transports goods by lorry
- headmasterly — In a manner befitting a headmaster.
- health stamp — a postage stamp with a surcharge that is used to support a health camp
- heath family — the plant family Ericaceae, characterized by evergreen or deciduous shrubs, trees, and woody plants growing in acid soil and having simple leaves, often showy flowers either solitary or in clusters, and fruit in the form of a berry or capsule, and including the azalea, blueberry, cranberry, heather, madrone, mountain laurel, rhododendron, and trailing arbutus.
- hebdomadally — taking place, coming together, or published once every seven days; weekly: hebdomadal meetings; hebdomadal groups; hebdomadal journals.
- heimskringla — a book of the 13th century narrating the history of the kings of Norway by Snorri Sturluson.
- helianthemum — (botany) Any of the genus Helianthemum of rockroses.
- helium flash — the explosive burning of helium in the case of a star of low mass that occurs when the core is so dense that the matter has become degenerate. The burning causes a rapid rise in temperature until it is so high that the gas ceases to be degenerate, after which there is a rapid expansion
- hellgramites — Plural form of hellgramite.
- hellgrammite — the aquatic larva of a dobsonfly, used as bait in fishing.
- helmsmanship — the skill or function of a helmsman
- 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)
- hepatomegaly — an abnormal enlargement of the liver, usually associated with liver disease or heart failure.
- hermetically — so as to be airtight: hermetically sealed.
- heroicomical — blending heroic and comic elements: a heroicomic poem.
- hibernaculum — a protective case or covering, especially for winter, as of an animal or a plant bud.
- hill farming — the activity and business of having a hill farm
- hiram revels — Hiram Rhoades [rohdz] /roʊdz/ (Show IPA), 1822–1901, U.S. clergyman, educator, and politician: first black senator 1870–71.
- hofmannsthal — Hugo von [hoo-goh fuh n] /ˈhu goʊ fən/ (Show IPA), 1874–1929, Austrian poet, playwright, and librettist.
- hojatoleslam — a title of respect given to an ayatollah or a middle-ranking Shiite cleric, which means literally 'proof of Islam'
- holiday camp — In Britain, a holiday camp is a place which provides holiday accommodation and entertainment for large numbers of people.
- holiday home — a home that people own in order to holiday in and that is in a different location to the home they usually live in
- holidaymaker — vacationer.
- holkham hall — a Palladian mansion near Wells in Norfolk: built 1734–59 by William Kent for Thomas Coke
- homeothermal — homoiothermal.
- homo habilis — an extinct species of upright East African hominid having some advanced humanlike characteristics, dated as being from about 1.5 million to more than 2 million years old and proposed as an early form of Homo leading to modern humans.
- homolecithal — having a fairly uniform distribution of yolk, as certain eggs or ova having relatively little yolk.
- homologation — to approve; confirm or ratify.
- homologumena — the books in the New Testament generally held as authoritative and canonical by the early church.
- homosexually — In a homosexual way.
- horometrical — Relating to horometry.
- human shield — a person or group of people located or intentionally placed in a potential line of fire or in an area likely to be attacked.
- humble plant — sensitive plant (def 1).