16-letter words containing a, e, o, n

not the faintest — no idea whatsoever
nuclear emulsion — a photographic emulsion in the form of a thick block, used to record the tracks of elementary particles.
nuclear envelope — the double membrane surrounding the nucleus within a cell.
nuclear magneton — a unit of magnetic moment, used to measure proton spin and approximately equal to 1/1836 Bohr magneton.
nuclear reaction — reaction (def 8).
nucleophilically — In a nucleophilic manner.
nueva ocotepeque — a town in W Honduras.
numbered account — a bank account whose owner is identified by a number for the purpose of preserving anonymity.
nusslein-volhard — Christiane [kris-tee-ah-nuh,, kris-tyah-] /ˌkrɪs tiˈɑ nə,, krɪsˈtyɑ-/ (Show IPA), born 1942, German biologist: Nobel prize 1995.
objective danger — a danger, such as a stone fall or avalanche, to which climbing skill is irrelevant
oblique triangle — any triangle that does not have a right angle (contrasted with right triangle).
oblique zenithal — a type of map projection in which part of the earth's surface is projected onto a plane tangential to it between the poles and the equator
obsequent stream — a stream flowing in a direction opposite to that of the dip of the local strata.
observation deck — an area on a high building that is surrounded with railings or fencing and which provides panoramic views
observation post — a forward position, often on high ground, from which enemy activity can be observed and, particularly, from which artillery or mortar fire can be directed.
observation ward — a ward in a hospital where patients are monitored
observationalist — One who relies on empirical observations.
observationality — The property of being observational.
occasional table — a small table with no regular use
occupation layer — (on an archaeological site) a layer of remains left by a single culture, from which the culture can be dated or identified.
octanedioic acid — a colourless crystalline dicarboxylic acid found in suberin and castor oil and used in the manufacture of synthetic resins. Formula: HOOC(CH2)6COOH
odds are against — If you say that the odds are against something or someone, you mean that they are unlikely to succeed.
of a certain age — of an unspecified age, but no longer young
of human bondage — a novel (1915) by W. Somerset Maugham.
of the nature of — having the essential character of; like
offensive weapon — an instrument designed to be used in attack, or an object which may be used in attack
ohmic resistance — resistance (def 3a).
oil storage tank — a very large industrial container where petroleum is stored
okefenokee swamp — a large wooded swamp area in SE Georgia.
oligodendroglial — Of or pertaining to the oligodendroglia.
on (the) average — as an average quantity, rate, etc.
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 its last legs — about to fail
on the back foot — at a disadvantage; outmanoeuvred or outclassed by an opponent
on the bandwagon — on the popular or apparently winning side, as in an election
on the beam-ends — tipping so far to the side as to be in danger of capsizing
on the breadline — impoverished; living at subsistence level
on the downgrade — waning in importance, popularity, health, etc
on the safe side — as a precaution
on the same page — one side of a leaf of something printed or written, as a book, manuscript, or letter.
on the scrapheap — (of people or things) having outlived their usefulness
on the up and up — to, toward, or in a more elevated position: to climb up to the top of a ladder.
on the up-and-up — to, toward, or in a more elevated position: to climb up to the top of a ladder.
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.
once upon a time — at one time in the past; formerly: I was a farmer once; a once powerful nation.
one and the same — When two or more people or things are thought to be separate and you say that they are one and the same, you mean that they are in fact one single person or thing.
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 in a million — person: unique

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