12-letter words containing a, h, o, m
- hambletonian — one of a superior strain of American trotting horses descended from the stallion Hambletonian.
- hammarskjold — Dag Hjalmar [dahg yahl-mahr] /dɑg ˈyɑl mɑr/ (Show IPA), 1905–61, Swedish statesman: Secretary General of the United Nations 1953–61; Nobel Peace Prize 1961.
- hammer throw — a field event in which the hammer is thrown for distance.
- hamming code — (algorithm) Extra, redundant bits added to stored or transmitted data for the purposes of error detection and correction. Named after the mathematician Richard Hamming, Hamming codes greatly improve the reliability of data, e.g. from distant space probes, where it is impractical, because of the long transmission delay, to correct errors by requesting retransmission.
- hand-me-down — an article of clothing passed on to another person after being used, outgrown, etc.: The younger children wore the hand-me-downs of the older ones.
- handsomeness — The quality of being handsome.
- hansom (cab) — a 19th-cent. two-wheeled covered carriage for two passengers, pulled by one horse: the driver's seat is above and behind the cab
- harbormaster — A harbormaster is the official in charge of a harbor.
- hard-mouthed — of or relating to a horse not sensitive to the pressure of a bit.
- 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.
- harmonichord — a musical instrument resembling an upright piano intended to fuse the sound of a violin with the functionality of a piano, the tone therefore produced using friction rather than through striking
- harmoniously — marked by agreement in feeling, attitude, or action: a harmonious group.
- harmoniumist — a person who plays a harmonium
- harmonizable — That can be harmonized.
- harmonograph — an instrument using a system of pendulums to produce geometric images
- harmonometer — the equipment used for measuring the harmonic relations of sounds
- harvest home — the bringing home of the harvest.
- harvest moon — the moon at and about the period of fullness that is nearest to the autumnal equinox.
- have company — If you have company, you have a visitor or friend with you.
- headforemost — headfirst (def 1).
- heavy bomber — a large plane capable of carrying heavy bomb loads for long distances, especially at high altitudes.
- hebdomadally — taking place, coming together, or published once every seven days; weekly: hebdomadal meetings; hebdomadal groups; hebdomadal journals.
- hemangiomata — See under angioma.
- hemarthrosis — (pathology) bleeding in the joints.
- hematoblasts — Plural form of hematoblast.
- hematochezia — the passage of bloody stools.
- hematocolpos — (medicine) A medical condition in which the vagina fills with menstrual blood, often caused by the combination of menstruation with an imperforate hymen.
- hematogenous — originating in the blood.
- hematologist — the study of the nature, function, and diseases of the blood and of blood-forming organs.
- hematophobia — Fear of bleeding or the sight of blood.
- hemerocallis — the genus comprising the day lilies.
- hemichordate — belonging or pertaining to the chordates of the phylum Hemichordata, comprising small, widely distributed, marine animals, as the acorn worms.
- 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.
- hemodynamics — the branch of physiology dealing with the forces involved in the circulation of the blood.
- hemophiliacs — Plural form of hemophiliac.
- hemorrhaging — a profuse discharge of blood, as from a ruptured blood vessel; bleeding.
- 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.
- heroic drama — Restoration tragedy, especially that popular in England c1660–1700, using highly rhetorical language and written in heroic couplets.
- heroicomical — blending heroic and comic elements: a heroicomic poem.
- heterogamete — either of a pair of conjugating gametes differing in form, size, structure, or sex.
- heterogamety — the condition or state of being heterogametic
- heterogamous — Genetics. having unlike gametes, or reproducing by the union of such gametes (opposed to isogamous).
- hidrocystoma — An adenoma of the sweat glands.
- hierogrammat — a writer of hierograms.