12-letter words containing h, o, m, r
- homothermous — (biology) warm-blooded.
- honeymooners — Plural form of honeymooner.
- honor system — a system whereby the students at a school, the inmates in a prison, etc., are put on their honor to observe certain rules in order to minimize administrative supervision or to promote honesty.
- hop hornbeam — any of several Eurasian and North American trees of the genus Ostrya, of the birch family, especially O. virginiana, bearing hoplike fruiting clusters.
- hopper frame — a window frame having one or more upper sashes hinged at the bottoms and opening inward.
- horometrical — Relating to horometry.
- horse manure — horse's excrement
- horse marine — (formerly) a marine mounted on horseback or a cavalryman doing duty on shipboard.
- horsemanship — the art, ability, skill, or manner of a horseman.
- hot-tempered — easily angered; short-tempered.
- house martin — a small European swallow, Delichon urbica, that builds its nest under the eaves of houses.
- house number — the unique number given to each building on a street which forms part of that building's address
- housemasters — Plural form of housemaster.
- housemothers — Plural form of housemother.
- housewarming — a party to celebrate a person's or family's move to a new home.
- humorousness — (uncountable) The state or quality of being humorous.
- humourlessly — Alternative spelling of humorlessly.
- hydatidiform — like or resembling a hydatid
- hydrobromate — (chemistry) hydrobromide.
- hydrobromide — a salt formed by the direct union of hydrobromic acid and an organic base, especially an alkaloid, usually more soluble than the base.
- hydrodynamic — pertaining to forces in or motions of liquids.
- hydroforming — the production of high-octane aromatic compounds for motor fuels by catalytic reforming of naphthas in the presence of hydrogen.
- hydromedusae — Irregular plural form of hydromedusa.
- hydrometeors — Plural form of hydrometeor.
- hydromorphic — of or relating to soil having characteristics that are developed when there is excess water all or part of the time.
- hydrothermal — noting or pertaining to the action of hot, aqueous solutions or gases within or on the surface of the earth.
- hydrotropism — oriented growth in response to water.
- hygrothermal — (physics) Of or pertaining to both humidity and temperature.
- hylomorphism — the theory that every physical object is composed of two principles, an unchanging prime matter and a form deprived of actuality with every substantial change of the object.
- hymenopteran — hymenopterous.
- hymenopteron — hymenopteran.
- hyperchromic — (physics, chemistry) Describing an increase in the intensity of a spectral band due to a change in the molecular environment.
- hypercomplex — (mathematics) Describing any of several types of higher-dimensional numbers having some characteristics of complex numbers.
- hypermetropy — Dated form of hypermetropia.
- hyperosmolar — Of, pertaining to, or as a result of hyperosmolarity.
- hypersarcoma — a growth of proud or fungous flesh
- hypersomniac — a tendency to sleep excessively.
- hypervolemia — (medicine) An abnormal increase in the volume of blood circulating through the body.
- hypogastrium — the lower and median part of the abdomen.
- hyponatremia — (medicine) An abnormally low concentration of sodium (or salt) in blood plasma.
- hypsochromic — (physics) Of a change in the position of a spectral band, to a higher frequency.
- hysterectomy — excision of the uterus.
- hysteromania — unusually increased sexual desire in a woman
- iambographer — a person who writes iambs
- iatrochemist — a person who practises iatrochemistry
- idiorhythmic — (of an institution) allowing each member to regulate his or her own life
- idiothermous — warm-blooded
- impoverished — reduced to poverty.
- impoverisher — Someone who impoverishes.
- impoverishes — Third-person singular simple present indicative form of impoverish.