9-letter words containing o, h, a
- hotplates — Plural form of hotplate.
- hour hand — the hand that indicates the hours on a clock or watch.
- hourglass — an instrument for measuring time, consisting of two bulbs of glass joined by a narrow passage through which a quantity of sand or mercury runs in just an hour.
- hourplate — the dial of a clock or watch
- houseboat — a flat-bottomed, bargelike boat fitted for use as a floating dwelling but not for rough water.
- housecarl — a member of the household troops or bodyguard of a Danish or early English king or noble.
- housecats — Plural form of housecat.
- housecoat — a woman's robe or dresslike garment in various lengths, for casual wear about the house.
- housemaid — a female servant employed in general domestic work in a home, especially to do housework.
- housemate — a person with whom one shares a house or other residence.
- houseware — Homeware.
- houstonia — any North American plant, belonging to the genus Houstonia, of the madder family, especially H. caerulea, the common bluet.
- hovhaness — Alan, 1911–2000, U.S. composer.
- how about — introducing a suggestion
- hu jintao — born 1942, Chinese Communist statesman; president of China (2003–2013)
- hula hoop — toy: plastic hoop
- humanhood — the state or character of being human
- humanoids — Plural form of humanoid.
- humorally — in a humoral manner or from a humoral point of view
- hurricano — (obsolete) A waterspout; a hurricane.
- hyalomere — the transparent part of a blood platelet, surrounding the chromomere.
- hyalonema — a species of sponge with a long stem made up of long, twisted glass-like fibres
- hybridoma — a hybrid cell made in the laboratory by fusing a normal cell with a cancer cell, usually a myeloma or lymphoma, in order to combine desired features of each, as the ability of the cancer cell to multiply rapidly with the ability of the normal cell to dictate the production of a specific antibody.
- hydantoin — a colorless, needlelike, crystalline compound, C 3 H 4 N 2 O 2 , used in the synthesis of pharmaceutical substances and resins.
- hydathode — a specialized leaf structure through which water is exuded.
- hydration — any of a class of compounds containing chemically combined water. In the case of some hydrates, as washing soda, Na 2 CO 3 ⋅10H 2 O, the water is loosely held and is easily lost on heating; in others, as sulfuric acid, SO 3 ⋅H 2 O, or H 2 SO 4 , it is strongly held as water of constitution.
- hydrazoic — noting or pertaining to hydrazoic acid; triazoic.
- hydrazone — any of a class of compounds containing the group >C=NNH 2 .
- hydrocast — a process in which water is collected at various depths in a device with bottles clamped together, providing data on differing water characteristics.
- hydrolant — an urgent warning of navigational dangers in the Atlantic Ocean, issued by the U.S. Navy Hydrographic Office.
- hydrolase — an enzyme that catalyzes hydrolysis.
- hydronaut — a person trained to work in deep-sea vessels for research and rescue purposes.
- hydrosoma — hydrosome.
- hydrostat — an electrical device for detecting the presence of water, as from overflow or leakage.
- hydrovane — a vane on a seaplane conferring stability on water (a sponson) or facilitating take off (a hydrofoil)
- hydrozoan — any freshwater or marine coelenterate of the class Hydrozoa, including free-swimming or attached types, as the hydra, in which one developmental stage, either the polyp or medusa, is absent, and colonial types, as the Portuguese man-of-war, in which both medusa and polyp stages are present in a single colony.
- hygrogram — the record made by a hygrograph.
- hygrostat — an instrument for measuring and controlling humidity.
- hylobates — Plural form of hylobate.
- hynagogic — Misspelling of hypnagogic.
- hyperbola — the set of points in a plane whose distances to two fixed points in the plane have a constant difference; a curve consisting of two distinct and similar branches, formed by the intersection of a plane with a right circular cone when the plane makes a greater angle with the base than does the generator of the cone. Equation: x 2 /a 2 − y 2 /b 2 = ±1.
- hypernova — (astronomy) The gravitational collapse of a massive star to form a black hole.
- hyperopia — a condition of the eye in which parallel rays are focused behind the retina, distant objects being seen more distinctly than near ones; farsightedness (opposed to myopia).
- hyperoxia — (pathology) A condition caused by an excess of oxygen in tissues and organs.
- hypnoidal — characterizing a state that resembles mild hypnosis but that is usually induced by other than hypnotic means.
- hypobaric — (of an anesthetic) having a specific gravity lower than that of cerebrospinal fluid. Compare hyperbaric (def 1).
- hypobasis — the lowermost distinctively treated part of a base.
- hypoblast — the endoderm.
- hypocaust — a hollow space or system of channels in the floor or walls of some ancient Roman buildings that provided a central heating system by receiving and distributing the heat from a furnace.
- hypocracy — Misspelling of hypocrisy.