10-letter words containing h, o, a, r
- north star — Polaris.
- north-east — The north-east is the direction which is halfway between north and east.
- northlands — Plural form of northland.
- northwards — Also, northwards, northwardly. toward the north.
- nosography — the systematic description of diseases.
- o'flaherty — Liam [lee-uh m] /ˈli əm/ (Show IPA), 1896–1984, Irish novelist.
- oak harbor — a town in NW Washington.
- oberhausen — a city in W Germany, in the lower Ruhr valley.
- ochlocracy — government by the mob; mob rule; mobocracy.
- ochratoxin — a toxin produced by Aspergillus ochraceus and several other molds that commonly contaminate cereal grains: causes intestinal inflammation and kidney and liver degeneration when ingested by animals.
- octachoron — (mathematics) A four-dimensional object equivalent to a cube, constructed out of sixteen cubes.
- octahedral — having the form of an octahedron.
- octahedron — a solid figure having eight faces.
- of a truth — certainly
- oil-harden — to quench (steel) in a bath of oil.
- oireachtas — the parliament of the Republic of Ireland, consisting of the president, the Dail Eireann, and the Seanad Eireann.
- oleographs — Plural form of oleograph.
- oligarchic — of, relating to, or having the form of an oligarchy.
- on draught — Beer that is on draught is kept in and served from a barrel rather than a bottle.
- on the air — a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere.
- ophiolater — a person who worships snakes
- ophiolatry — the worship of snakes.
- opotherapy — organotherapy.
- or another — You use or another in expressions such as one kind or another when you do not want to be precise about which of several alternatives or possibilities you are referring to.
- orcharding — the cultivation of orchards
- orchardist — a person who owns, manages, or cultivates an orchard.
- orchardman — A man who owns or tends an orchard.
- orchestral — of, relating to, or resembling an orchestra.
- orchestras — Plural form of orchestra.
- ore hearth — a small blast furnace for smelting lead.
- orichalcum — a brass rich in zinc, prepared by the ancients.
- orographic — Of or relating to mountains, especially with regard to their position and form.
- oropharynx — the part of the pharynx between the soft palate and the upper edge of the epiglottis.
- orphanages — Plural form of orphanage.
- orphanhood — a child who has lost both parents through death, or, less commonly, one parent.
- orpharions — Plural form of orpharion.
- orthocaine — a methyl ester used for local anaesthesia
- orthoclase — a common white or pink mineral of the feldspar group, KAlSi 3 O 8 , having two good cleavages at right angles, and found in silica-rich igneous rocks: used in the manufacture of porcelain.
- orthogonal — Mathematics. Also, orthographic. pertaining to or involving right angles or perpendiculars: an orthogonal projection. (of a system of real functions) defined so that the integral of the product of any two different functions is zero. (of a system of complex functions) defined so that the integral of the product of a function times the complex conjugate of any other function equals zero. (of two vectors) having an inner product equal to zero. (of a linear transformation) defined so that the length of a vector under the transformation equals the length of the original vector. (of a square matrix) defined so that its product with its transpose results in the identity matrix.
- orthograde — walking in an upright manner
- orthograph — An orthographic projection.
- orthopnoea — difficult or painful breathing except in an erect sitting or standing position.
- orthopraxy — correctness or orthodoxy of action or practice.
- orthoptera — Any of very many four-winged insects, of the order Orthoptera, such as grasshoppers, crickets and locusts.
- orthorexia — (psychology) A fixation with healthy or righteous eating.
- other half — the people of an economic class clearly different from one's own or from that to which reference is being made: a glimpse of how the other half lives.
- other than — additional or further: he and one other person.
- othergates — different or other
- our father — Lord's Prayer.
- outbreathe — to breathe out