18-letter words containing n, a, o, t

not that i know of — You say 'Not that I know of' when someone has asked you whether or not something is true and you think the answer is 'no' but you cannot be sure because you do not know all the facts.
not to have a clue — to be completely baffled
notifiable disease — any one of a number of infectious diseases of humans and animals, that must be reported to the public health authorities
noun incorporation — a process in word formation by which a compound is created by affixing or infixing a noun to a verb, as in baby-sit, house-hunt, and sleep-walk.
nova scotia salmon — an Atlantic salmon, especially from the waters off Nova Scotia, cured in the local manner.
now you're talking — at last you're saying something agreeable
numerical taxonomy — classification of organisms by a comparison of large numbers of observable characteristics that are given equal value instead of being weighted according to possible evolutionary significance.
nurse practitioner — a registered nurse who has received special training for diagnosing and treating routine or minor ailments. Abbreviation: NP.
nurse-practitioner — a registered nurse who has received special training for diagnosing and treating routine or minor ailments. Abbreviation: NP.
oath of allegiance — pledge to one's nation
obedience training — the training of an animal, especially a dog, to obey certain commands.
object-orientation — object-oriented
occupational group — An occupational group is a category used by insurance companies to classify jobs according to how hazardous they are.
octachlorobiphenyl — (organic compound) Either of twelve isomers of the polychlorinated biphenyl containing eight chlorine atoms.
oedipus at colonus — a tragedy by Sophocles, written toward the end of his life and produced posthumously in 401? b.c.
off-street parking — spaces for cars located on private property rather than on a public street
offensive material — any published or broadcast content (such as articles, photographs, films, or websites) that is likely to be upsetting, insulting, or objectionable to some or most people
oil of catechumens — holy oil used in baptism, the ordination of a cleric, the coronation of a sovereign, or in the consecration of a church.
old man of the sea — (in The Arabian Nights' Entertainments) an old man who clung to the shoulders of Sindbad the Sailor for many days and nights.
on a sticky wicket — in an awkward situation
on automatic pilot — If you are on automatic pilot or on autopilot, you are acting without thinking about what you are doing, usually because you have done it many times before.
on delicate ground — in a situation requiring tact
on one's last legs — either of the two lower limbs of a biped, as a human being, or any of the paired limbs of an animal, arthropod, etc., that support and move the body.
on that/this score — You can use on that score or on this score to refer to something that has just been mentioned, especially an area of difficulty or concern.
on the back burner — low priority
on the danger list — critically ill in hospital
on the ragged edge — precariously close to loss of self-control, mental stability, etc.
once in a lifetime — extremely rarely
one way or another — somehow, by some means
one's heart bleeds — used to express sympathetic grief, but often used ironically
one's native heath — the place of one's birth or childhood
open heart surgery — surgery performed on the exposed heart while a heart-lung machine pumps and oxygenates the blood and diverts it from the heart.
open-heart surgery — surgery performed on the exposed heart while a heart-lung machine pumps and oxygenates the blood and diverts it from the heart.
operating expenses — Operating expenses are expenses related to carrying out normal business activities.
operating software — software used in the operation of a computer system, typically by performing such tasks as memory allocation, job scheduling, and input/output control
operation overlord — the codename for the Allied invasion (June 1944) of northern France
operationalisation — Alternative spelling of operationalization.
operationalization — The act or process of operationalizing.
operations manager — business director
optical brightener — an additive that dyes and brightens fabric or paper
optical soundtrack — the final soundtrack on a motion picture, which appears as a band of black and white serrations along a strip of film to the left of the composite print. Light is shined through the serrations and is converted to audible sound.
optimum population — a population that is sufficiently large to provide an adequate workforce with minimal unemployment
oracle corporation — (company) The world's leading supplier of information management software. The company, worth $2 billion, offers its products, along with related consulting, education and support services in more than 90 countries around the world. Oracle is best known for its database management systems vendor and relational DBMS products. Oracle develops and markets Oracle Media Server and the Oracle7 family of software products for database management; Co-operative Development Environment and Oracle Co-operative Applications Oracle software runs on personal digital assistants, set-top boxs, IBM PCs, workstations, minicomputers, mainframes and massively parallel computers. Oracle bought Sun Microsystems on 2009-04-20. See also Adaptable User Interface, Bookviewer, CASE*Method, Component Integration Laboratories, DDE Manager, Online Media, Oracle Card, Oracle*CASE, siod. Address: Redwood Shores, CA, USA.
oral contraceptive — birth-control pill.
order of magnitude — You can use order of magnitude when you are giving an approximate idea of the amount or importance of something.
organic solidarity — social cohesiveness that is based on division of labor and interdependence and is characteristic of complex, industrial societies.
organization chart — a diagrammatic representation showing how departments or divisions in an organization, as a large corporation, are related to one another along lines of authority.
oriental alabaster — alabaster (def 2).
oriental almandine — a variety of corundum resembling almandine in colour and used as a gemstone
oriental cat's-eye — a chatoyant variety of chrysoberyl, used as a gem.

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