17-letter words containing s, e, n, a

not spare oneself — to exert oneself to the full
nothing less than — You can use nothing less than to emphasize your next words, often indicating that something seems very surprising or important.
nuclear chemistry — the branch of chemistry concerned with nuclear reactions
nuclear isomerism — isomerism (def 2).
nuclear scientist — a scientist who studies nuclear physics
nuclear submarine — undersea vessel powered by atomic energy
nuclear threshold — the point in war at which a combatant brings nuclear weapons into use
nuclear-isomerism — Chemistry. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism) as CH 3 OCH 3 and CH 3 CH 2 OH, or in the arrangement of their atoms in space and therefore in one or more properties. Compare optical isomerism, stereoisomerism.
nursery education — education provided at a school for young children, usually from three to five years old
objectionableness — The quality of being objectionable.
observation tower — lookout, observation point
odds-on favourite — a person, team, horse, etc that is regarded as the most likely to win a competition
off one's own bat — If someone does something off their own bat, they do it without anyone else suggesting it.
old age pensioner — An old age pensioner is a person who is old enough to receive an pension from their employer or the government.
old red sandstone — a thick sequence of sedimentary rock (generally, but not always, red) deposited in Britain and NW Europe during the Devonian period
olympic peninsula — a large peninsula of W Washington
omphalomesenteric — (anatomy) Of or pertaining to the umbilicus and mesentery.
on a razor's edge — in an acute dilemma
on one's deathbed — about to die
on someone's back — criticizing or pestering someone
on someone's tail — following or shadowing someone closely
on speaking terms — the act, utterance, or discourse of a person who speaks.
on the half shell — served raw, with seasonings, on a half shell
on the heavy side — tending to be too heavy
on the pig's back — successful; established
on-street parking — parking (of a car, vehicle, etc) that is or is allowed to be done on a street
one of these days — at some future time
one size fits all — (of clothing) designed to fit people of a wide range of sizes.
one-size-fits-all — (of clothing) designed to fit people of a wide range of sizes.
one-time password — (security) (OTP) A security system that requires a new password every time a user authenticates themselves, thus protecting against an intruder replaying an intercepted password. OTP generates passwords using either the MD4 or MD5 hashing algorithms. The equivalent term "S/Key", developed by Bellcore, is a trademark of Telcordia Technologies, so the name OTP is used increasingly. See RFC 1760 - "The S/KEY One-Time Password System" and RFC 1938 - "A One-Time Password System".
opening arguments — the statements or arguments provided by lawyers at the beginning of a trial
operation sealion — the codename for Hitler's proposed invasion (1940) of Great Britain
operations centre — a centre where activities of a business, organization, etc, are administrated and take place
opisthobranchiate — (zoology) Of or pertaining to the Opisthobranchiata.
orange free state — a province in central Republic of South Africa: a Boer republic 1854–1900; a British colony (Orange River Colony, ) 1900–10. 49,647 sq. mi. (128,586 sq. km). Capital: Bloemfontein.
organ-pipe cactus — a treelike or columnar cactus, Lemaireocereus marginatus, of Mexico, having a central, erect spine surrounded by spreading spines in clusters of five to eight, and funnel-shaped, brownish-purple flowers.
organic chemistry — the branch of chemistry, originally limited to substances found only in living organisms, dealing with the compounds of carbon.
osculating circle — circle of curvature.
out of all reason — unreasonable
out of one's head — the upper part of the body in humans, joined to the trunk by the neck, containing the brain, eyes, ears, nose, and mouth.
over-compensation — a pronounced striving to neutralize and conceal a strong but unacceptable character trait by substituting for it an opposite trait.
over-conservative — disposed to preserve existing conditions, institutions, etc., or to restore traditional ones, and to limit change.
overreach oneself — to fail because of trying to do more than one can
oversquare engine — An oversquare engine is an engine which has a cylinder bore that is larger than its stroke.
pacific northwest — the region of North America lying north of the Columbia River and west of the Rockies
paleoconservative — a person advocating an older, traditional type of conservatism, especially in politics.
papanicolaou test — Pap test.
paradise regained — an epic poem (1671) by John Milton.
parallel universe — Physics. any of a hypothetical collection of undetectable universes that are like our known universe but have branched off from our universe due to a quantum-level event. See also multiverse.
parents anonymous — (in Britain) an association of local voluntary self-help groups offering help through an anonymous telephone service to parents who fear they will injure their children, or who have other problems in managing their children

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