15-letter words containing o, s, n, a
- numismatologist — One versed in numismatology.
- object distance — the distance between the lens of a camera and an object being photographed.
- oblique sailing — the navigation of a vessel on a point of the compass other than one of the cardinal points.
- observation car — a railroad passenger car having a lounge or platform from which the scenery can be viewed.
- observationally — of, relating to, or founded on observation, especially founded on observation rather than experiment.
- obsidian dating — a method of dating obsidian artifacts or debitage by calculating how long it has taken to produce a given thickness of a hydration layer within such matter.
- obsidional coin — siege piece.
- obtuse triangle — a triangle with one obtuse angle.
- ocean of storms — the largest of the dark plains (maria) on the surface of the moon, situated in the second and third quadrant
- odontostomatous — having jaws that resemble teeth
- off one's guard — to keep safe from harm or danger; protect; watch over: to guard the ruler.
- off one's hands — for which one is no longer responsible
- oil-based paint — any paint made with a drying oil or solvent such as linseed
- old age pension — An old age pension is a regular amount of money that people receive from the government when they have retired from work.
- old clothes man — a person who deals in second-hand clothes
- old man's beard — fringe tree.
- old-man's-beard — fringe tree.
- old-man-the-sea — (in The Arabian Nights' Entertainments) an old man who clung to the shoulders of Sindbad the Sailor for many days and nights.
- oligohydramnios — (medicine) A deficit of amniotic fluid in the amniotic sac, causing distinctive deformations of the foetus.
- oligomerisation — Alternative spelling of oligomerization.
- on a shoestring — If you do something or make something on a shoestring, you do it using very little money.
- on o's haunches — If you get down on your haunches, you lower yourself towards the ground so that your legs are bent under you and you are balancing on your feet.
- on the decrease — decreasing
- on the increase — growing, increasing
- one's last hour — the time of one's death
- one-dimensional — having one dimension only.
- one-night stand — a single performance in one locale, as by a touring theatrical company, before moving on to the next engagement.
- onomasiological — the study of the means of expressing a given concept.
- onward progress — progress that advances or improves (a situation, etc)
- open admissions — a policy of admitting applicants to an institution, especially a university, regardless of previous academic record or grades.
- opencast mining — mining by excavating from the surface
- opening batsman — a player who bats the first ball in cricket
- operationalised — Simple past tense and past participle of operationalise.
- operations room — a room from which all the operations of a military, police, or other disciplined activity are controlled
- opinionatedness — The state or condition of being opinionated.
- opisthognathous — having receding jaws.
- oppositionality — Quality of being oppositional.
- optical scanner — the process of interpreting data in printed, handwritten, bar-code, or other visual form by a device (optical scanner or reader) that scans and identifies the data.
- opus anglicanum — fine embroidery, esp of church vestments, produced in England c.1200–c.1350; characterized by the rich materials used, esp silver gilt thread
- orangeman's day — the 12th of July, celebrated by Protestants in Northern Ireland to commemorate the anniversary of the Battle of the Boyne (1690)
- orangemen'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.
- orchestrational — Of or pertaining to orchestration.
- ordinal numbers — Also called ordinal numeral. any of the numbers that express degree, quality, or position in a series, as first, second, and third (distinguished from cardinal number).
- ordinary seaman — a seaman insufficiently skilled to be classified as an able-bodied seaman. Abbreviation: O.D., O.S., o.s.
- ordinary shares — British. a share of common stock.
- ordnance survey — mapmaking agency
- organic disease — a disease in which there is a structural alteration (opposed to functional disease).
- organized chaos — a complex situation or process that appears chaotic while having enough order to achieve progress or goals
- organochlorines — Plural form of organochlorine.
- organomagnesium — pertaining to or noting an organic compound, especially an organic halide, containing magnesium linked to carbon.