16-letter words containing r, d, o
- observation deck — an area on a high building that is surrounded with railings or fencing and which provides panoramic views
- observation ward — a ward in a hospital where patients are monitored
- ocellated turkey — a wild turkey, Agriocharis ocellata, of Yucatán, Belize, and Guatemala, typically having green, blue, reddish-brown, and yellowish-brown plumage of a metallic luster and eyelike spots on the tail.
- odds are against — If you say that the odds are against something or someone, you mean that they are unlikely to succeed.
- oder-neisse line — the boundary between Poland and East Germany after World War II.
- odontoid process — the toothlike upward projection at the back of the second vertebra of the neck
- of it own accord — If something happens of its own accord, it seems to happen by itself, without anyone making it happen.
- off off broadway — experimental or avant-garde drama produced in New York City, in small theaters, halls, churches, etc.
- off-off-broadway — experimental or avant-garde drama produced in New York City, in small theaters, halls, churches, etc.
- off-road vehicle — An off-road vehicle is a vehicle that is designed to travel over rough ground.
- off-the-shoulder — not covering the shoulder
- old north french — the dialect of Old French spoken in northern France. Abbreviation: ONF.
- old world monkey — any of various anthropoid primates of the family Cercopithecidae, of Africa, the Arabian peninsula, and Asia, typically having a hairless face, forward- or downward-directed nostrils, relatively short arms, flat nails, and either having a rudimentary tail or using the tail for balance rather than grasping, and including the baboon, colobus monkey, guenon, langur, macaque, mandrill, mangabey, patas, proboscis, and talapoin.
- old-girl network — an association among women that is comparable to or modeled on an old-boy network.
- oligodendroglial — Of or pertaining to the oligodendroglia.
- oligosaccharides — Plural form of oligosaccharide.
- on a world scale — in a way that involves the whole world
- on her beam-ends — (of a vessel) heeled over through an angle of 90°
- on the breadline — impoverished; living at subsistence level
- on the downgrade — waning in importance, popularity, health, etc
- on your doorstep — If a place is on your doorstep, it is very near to where you live. If something happens on your doorstep, it happens very close to where you live.
- onboard computer — onboard a vehicle, ship, plane, train or spacecraft
- once and for all — former; having at one time been: the once and future king.
- one for the road — a long, narrow stretch with a smoothed or paved surface, made for traveling by motor vehicle, carriage, etc., between two or more points; street or highway.
- one-armed bandit — slot machine (def 1).
- open-die forging — Open-die forging is a forging process in which the flow of metal is not kept completely in the die.
- operating budget — money allocated to a project
- opposed-cylinder — (of an internal-combustion engine) having cylinders on opposite sides of the crankcase in the same plane
- orange marmalade — preserve made from oranges
- orange men's day — July 12, an annual celebration in Northern Ireland and certain cities having a large Irish section, especially Liverpool, to mark both the victory of William III over James II at the Battle of the Boyne, July 1, 1690, and the Battle of Augbrim, July 12, 1690.
- order in council — (in Britain and various other Commonwealth countries) a decree of the Cabinet, usually made under the authority of a statute: in theory a decree of the sovereign and Privy Council
- order of service — a prescribed form of liturgical service, or of administration of a rite or ceremony
- order of the day — the agenda for an assembly, meeting, group, or organization.
- ordinary jubilee — the celebration of any of certain anniversaries, as the twenty-fifth (silver jubilee) fiftieth (golden jubilee) or sixtieth or seventy-fifth (diamond jubilee)
- ordnance factory — a factory that makes military weapons and ammunition
- organized labour — labour carried out by workers in trade unions, or the workers themselves
- oriental emerald — a green variety of corundum used as a gemstone
- orographic cloud — any cloud whose existence and form are largely controlled by the disturbed flow of air over and around mountains, as the banner cloud and crest cloud.
- orthodox judaism — Judaism as observed by Orthodox Jews.
- orthodoxy sunday — a solemn festival held on the first Sunday of Lent (Orthodoxy Sunday) commemorating the restoration of the use of icons in the church (a.d. 842) and the triumph over all heresies.
- orthoformic acid — a hypothetical acid, HC(OH) 3 , known only in the form of its esters.
- osmium tetroxide — a crystalline or amorphous, colorless, poisonous compound, OsO 4 , soluble in water, alcohol, and ether: used for microscopic staining, in photography, and as a catalyst in organic synthesis.
- otherworldliness — The quality of being otherworldly.
- out of your mind — If you say that someone is out of their mind, you mean that they are mad or very foolish.
- outboard profile — an exterior side elevation of a vessel, showing all deck structures, rigging, fittings, etc.
- outside director — a director of a company who is not employed by that company but is often employed by a holding or associated company
- over-descriptive — having the quality of describing; characterized by description: a descriptive passage in an essay.
- overdramatically — In an overdramatic manner.
- overhead railway — elevated railroad.
- oxidation number — the state of an element or ion in a compound with regard to the electrons gained or lost by the element or ion in the reaction that formed the compound, expressed as a positive or negative number indicating the ionic charge of the element or ion.