17-letter words containing r, d, o

noun pre-modifier — a noun that occurs before and modifies another noun, as toy in toy store or tour in tour group.
nuclear radiation — Physics. radiation in the form of elementary particles emitted by an atomic nucleus, as alpha rays or gamma rays, produced by decay of radioactive substances or by nuclear fission.
nuclear threshold — the point in war at which a combatant brings nuclear weapons into use
number three wood — spoon (def 5).
nursery education — education provided at a school for young children, usually from three to five years old
object identifier — (programming) (OID) Generally an implementation-specific integer or pointer that uniquely identifies an object.
odds-on favourite — a person, team, horse, etc that is regarded as the most likely to win a competition
odour of sanctity — sanctimoniousness
of its own accord — If something happens of its own accord, it seems to happen by itself, without anyone making it happen.
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 norman french — Norman French (sense 1)
old orchard beach — a resort town in S Maine.
old red sandstone — a thick sequence of sedimentary rock (generally, but not always, red) deposited in Britain and NW Europe during the Devonian period
old south arabian — a group of four closely related Semitic languages, having a writing system and used from about the eighth to the fifth centuries b.c. in the southern part of Arabia.
old spanish trail — an overland route from Santa Fe, N. Mex., to Los Angeles, Calif., first marked out in 1776 by Spanish explorers and missionaries.
old wives' summer — a period of fine, summerlike weather occurring in Europe in autumn.
on (or off) duty — at (or temporarily relieved from) one's work, duty, etc.
on a razor's edge — in an acute dilemma
on one's doorstep — very close or accessible
on the barrelhead — upon being presented for sale; at the time of delivery
on the other hand — the terminal, prehensile part of the upper limb in humans and other primates, consisting of the wrist, metacarpal area, fingers, and thumb.
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".
online dictionary — a dictionary that is available on the Internet or World Wide Web and accessed through a Web browser using a computer or a mobile device, primarily by typing a query term into a search box on the site. Online dictionaries like Dictionary.com offer immediate, direct access through large databases to a word's spelling and meanings, plus a host of ancillary information, including its variant spellings, pronunciation, inflected forms, origin, and derived forms, as well as supplementary notes on matters of interest or concern about how the word is used: Some people think online dictionaries will make print dictionaries obsolete.
open-end mortgage — a mortgage agreement against which new sums of money may be borrowed under certain conditions.
order of business — a task assigned or to be dealt with: Our first order of business is to reduce expenses.
orfeo ed euridice — an opera (1762), with music by Christoph Willibald von Gluck.
organized ferment — ferment (def 1).
organized militia — a former military organization functioning under both state and federal authority.
orifice discharge — Orifice discharge is a model for calculating how quickly a fluid will come out of a punctured vessel or pipe.
orthovanadic acid — an oxyacid of vanadium, known chiefly in the form of its vanadate salts. Formula: H3VO4
out of this world — the earth or globe, considered as a planet.
outside broadcast — An outside broadcast is a radio or television programme that is not recorded or filmed in a studio, but in another building or in the open air.
over my dead body — expressing complete refusal
overdetermination — the concept that a single emotional symptom or event, as a dream or a slip of the tongue, may be caused by more than one factor.
overhead camshaft — a camshaft in an automotive engine that is located in the cylinder head over the engine block rather than in the block. Abbreviation: OHC.
overhead lighting — lighting which throws light downwards by being situated on the ceiling or having a downward shade, etc
oyer and terminer — (in some U.S. states) any of various higher criminal courts.
paradoxical sleep — REM sleep.
paraperiodic acid — the crystalline compound H5IO6, an oxyacid of iodine
parathyroid gland — any of several small oval glands usually lying near or embedded in the thyroid gland.
parathyroidectomy — the excision of a parathyroid gland.
paratyphoid fever — Also called paratyphoid fever. an infectious disease, similar in some of its symptoms to typhoid fever but usually milder, caused by any of several bacilli of the genus Salmonella other than S. typhi.
pate de foie gras — See under foie gras.
performance drugs — the drugs that are taken illegally by athletes to enhance their sporting performance
peridot of ceylon — a honey-colored tourmaline, used as a gem: not a true peridot.
period-revolution — a rather large interval of time that is meaningful in the life of a person, in history, etc., because of its particular characteristics: a period of illness; a period of great profitability for a company; a period of social unrest in Germany.
periodic function — a function of a real or complex variable that is periodic.
periodic sentence — a sentence that, by leaving the completion of its main clause to the end, produces an effect of suspense, as in Unable to join the others at the dance because of my sprained ankle, I went to a movie.
periodical cicada — seventeen-year locust.
personal distance — personal space.

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