15-letter words containing e, s, r, o

northeastwardly — Towards the northeast.
northern lights — aurora borealis.
northern sennet — any of several small barracudas, as Sphyraena borealis (northern sennet) ranging along the eastern coast of North and Central America.
northwestwardly — Towards the northwest.
not be yourself — If you say that you are not yourself, you mean you are not feeling well.
not necessarily — If you reply 'Not necessarily', you mean that what has just been said or suggested may not be true.
nottinghamshire — a county in central England. 854 sq. mi. (2210 sq. km).
nuclear fission — fission (def 2).
nuisance ground — a garbage dump.
nutty professor — a professor or academic person who is eccentric or slightly crazy or unusual
nyquist theorem — (communications) A theorem stating that when an analogue waveform is digitised, only the frequencies in the waveform below half the sampling frequency will be recorded. In order to reconstruct (interpolate) a signal from a sequence of samples, sufficient samples must be recorded to capture the peaks and troughs of the original waveform. If a waveform is sampled at less than twice its frequency the reconstructed waveform will effectively contribute only noise. This phenomenon is called "aliasing" (the high frequencies are "under an alias"). This is why the best digital audio is sampled at 44,000 Hz - twice the average upper limit of human hearing. The Nyquist Theorem is not specific to digitised signals (represented by discrete amplitude levels) but applies to any sampled signal (represented by discrete time values), not just sound.
objective prism — a large prism placed in front of the objective lens or mirror of a telescope, allowing the simultaneous acquisition of the spectra of many stars.
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.
obstacle course — a military training area having obstacles, as hurdles, ditches, and walls, that must be surmounted or crossed in succession.
obstructiveness — The characteristic of being obstructive.
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
odoriferousness — The quality of being odoriferous.
off one's guard — to keep safe from harm or danger; protect; watch over: to guard the ruler.
officer of arms — an officer with the duties of a herald, especially one charged with the devising, granting, or confirming of armorial bearings.
official strike — a collective stoppage of work by part or all of the workforce of an organization with the approval of the trade union concerned. The stoppage may be accompanied by the payment of strike pay by the trade union concerned
offset printing — offset (def 6).
okhotsk current — a cold ocean current flowing SW from the Bering Sea, E of the Kurile Islands, along the E coast of Japan where it meets the Japan Current.
olbers' paradox — the paradox that if the universe consisted of an infinite number of stars equally distributed through space, then every line of sight would come from a star and the night sky would glow uniformly, which is observationally not true.
old man's beard — fringe tree.
old-man's-beard — fringe tree.
oligomerisation — Alternative spelling of oligomerization.
oligosaccharide — any carbohydrate yielding few monosaccharides on hydrolysis, as two, three, or four.
on a shoestring — If you do something or make something on a shoestring, you do it using very little money.
on one's honour — on the pledge of one's word or good name
on one's uppers — higher, as in place, position, pitch, or in a scale: the upper stories of a house; the upper register of a singer's voice.
on prescription — If a medicine is available on prescription, you can only get it from a chemist or pharmacist if a doctor gives you a prescription for it.
on short notice — with little warning
on the decrease — decreasing
on the increase — growing, increasing
one for his nob — the call made with this jack, scoring one point
one's last hour — the time of one's death
oneirocriticism — the art of interpreting dreams.
onward progress — progress that advances or improves (a situation, etc)
open university — higher education by correspondence
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
opposite number — counterpart; equivalent: New members with an interest in folk art will find their opposite numbers in the association's directory.
opposite prompt — the offstage area to the right as one faces the audience. Abbreviation: O.P.
opprobriousness — The state or condition of being opprobrious.
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.
optical storage — optical disk drive
optoelectronics — the branch of electronics dealing with devices that generate, transform, transmit, or sense optical, infrared, or ultraviolet radiation, as cathode-ray tubes, electroluminescent and liquid crystal displays, lasers, and solar cells.
orangeman's day — the 12th of July, celebrated by Protestants in Northern Ireland to commemorate the anniversary of the Battle of the Boyne (1690)

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