18-letter words containing a, d

mucopolysaccharide — (formerly) glycosaminoglycan.
multimedia machine — machines that allow users to control and manipulate sound, video, text and graphics
muscular dystrophy — a hereditary disease characterized by gradual wasting of the muscles with replacement by scar tissue and fat, sometimes also affecting the heart.
mutual aid society — A mutual aid society is an organization that provides benefits or other help to its members when they are affected by things such as death, sickness, disability, old age, or unemployment.
my lips are sealed — If you tell someone that your lips are sealed, you are promising them that you will keep a secret that they have told you.
nailed to the wall — [like a trophy] Said of a bug finally eliminated after protracted, and even heroic, effort.
naked and the dead — a novel (1948) by Norman Mailer.
national guardsman — guardsman (def 2).
native advertising — advertising content on a website that conforms to the design and format of the site and is integrated into the site’s usual content: native advertising that is almost indistinguishable from the paper’s news stories.
natural childbirth — childbirth involving little or no use of drugs or anesthesia and usually involving a program in which the mother is psychologically and physically prepared for the birth process.
neighborhood watch — a neighborhood surveillance program or group in which residents keep watch over one another's houses, patrol the streets, etc., in an attempt to prevent crime.
netherlands guiana — a former name of Suriname.
neural tube defect — any of a group of congenital abnormalities involving the brain and spinal cord, including spina bifida and meningocele, caused by failure of the neural tube to close properly during embryonic development.
neurodevelopmental — Of or pertaining to the development of neurological pathways in the brain.
neuropsychodynamic — Of or pertaining to neuropsychodynamics.
new forest disease — an infectious eye disease causing acute eye pain in cattle
new zealand on air — the operational name for the New Zealand Broadcasting Commission
new zealand pigeon — a large fruit-eating native pigeon, Hemiphagia novaeseelandiae, of forest areas
nickel-and-dime it — to succeed or obtain something gradually by the repeated expenditure of small sums or the slow gathering of votes, power, money, etc. in small increments
nickeled-and-dimed — of little or no importance; trivial; petty: a nickel-and-dime business that soon folded.
nominative-address — a noun naming the person to whom one is speaking.
non-contextualized — to put (a linguistic element, an action, etc.) in a context, especially one that is characteristic or appropriate, as for purposes of study.
non-denominational — of or relating to a denomination or denominations.
non-discriminative — constituting a particular quality, trait, or difference; characteristic; notable.
non-fundamentalist — (sometimes initial capital letter) a religious movement characterized by a strict belief in the literal interpretation of religious texts, especially within American Protestantism and Islam.
non-identification — an act or instance of identifying; the state of being identified.
non-understandable — capable of being understood; comprehensible.
nonstriated muscle — smooth muscle
nord-pas-de-calais — a region of N France, on the Straits of Dover (the Pas de Calais): coal-mining, textile, and metallurgical industries
normally aspirated — A normally aspirated or naturally aspirated engine breathes air at atmospheric pressure.
northeast corridor — the long, narrow strip of land between Boston, New York City, and Washington, D.C., containing many adjacent urban areas.
norwegian elkhound — one of a breed of dogs having a short, compact body, short, pointed ears, and a thick, gray coat, raised originally in Norway for hunting elk and other game.
not breathe a word — to take air, oxygen, etc., into the lungs and expel it; inhale and exhale; respire.
not take kindly to — not welcome
notifiable disease — any one of a number of infectious diseases of humans and animals, that must be reported to the public health authorities
nueva san salvador — Santa Tecla.
numerical identity — the relation that holds between two relata when they are the selfsame entity, that is, when the terms designating them have the same reference
oak-leaf hydrangea — a shrub, Hydrangea quercifolia, of the southeastern U.S., having lobed leaves and pyramidal clusters of white flowers.
obedience training — the training of an animal, especially a dog, to obey certain commands.
objective idealism — a form of idealism asserting that the act of experiencing has a reality combining and transcending the natures of the object experienced and of the mind of the observer.
objective modula-2 — (language) (Or "ObjM2") An extension to Modula-2 for Cocoa and GNUstep software development. Objective Modula-2 follows the Objective-C object model and retains the bracketed Smalltalk message passing syntax used in Objective-C. Classes written in ObjM2 can be used within ObjC and vice versa. ObjM2 also retains Modula-2's data encapsulation features, namely nested modules with explicit import and export lists. Due to the strict type checking in Modula-2, ObjM2 can be considered a much safer programming language than is ObjC, yet losing none of the capabilities of ObjC.
oedipus at colonus — a tragedy by Sophocles, written toward the end of his life and produced posthumously in 401? b.c.
office of readings — the first of the canonical hours; matins
officer of the day — an officer who has charge of the guard and prisoners on an assigned day at a military installation. Abbreviation: OD, O.D., O.O.D.
old low franconian — a Low German dialect of the Franks of the lower Rhine valley before c1100.
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.
omega-3 fatty acid — a polyunsaturated fatty acid, essential for normal retinal function, that influences various metabolic pathways, resulting in lowered cholesterol and triglyceride levels, inhibited platelet clotting, and reduced inflammatory and immune reactions.
on delicate ground — in a situation requiring tact
on one's beam-ends — out of resources; destitute
on the danger list — critically ill in hospital

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