17-letter words containing a, c, e, t

omphalomesenteric — (anatomy) Of or pertaining to the umbilicus and mesentery.
on the face of it — the front part of the head, from the forehead to the chin.
on the off chance — the absence of any cause of events that can be predicted, understood, or controlled: often personified or treated as a positive agency: Chance governs all.
on the off-chance — If you do something on the off-chance, you do it because you hope that it will succeed, although you think that this is unlikely.
on the pig's back — successful; established
on the wrong tack — a short, sharp-pointed nail, usually with a flat, broad head.
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.
onomatopoetically — the formation of a word, as cuckoo, meow, honk, or boom, by imitation of a sound made by or associated with its referent.
operations centre — a centre where activities of a business, organization, etc, are administrated and take place
opisthobranchiate — (zoology) Of or pertaining to the Opisthobranchiata.
optical carrier 3 — (networking) (OC-3) A SONET rate of 3 * 51.84 = 155.52 megabits per second, which matches STS-3.
optical carrier n — (networking) (OC-n) A SONET rate of n times 51.84 megabits per second.
optical isomerism — stereoisomerism in which the isomers are identical in molecular weight and most chemical and physical properties but differ in their effect on the rotation of polarized light.
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.
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-appreciation — gratitude; thankful recognition: They showed their appreciation by giving him a gold watch.
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.
overconcentration — the act of concentrating; the state of being concentrated.
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.
oystershell scale — a scale insect, Lepidosaphes ulmi, having a scale shaped like the shell of an oyster, which infests various deciduous trees and shrubs.
pacific northwest — the region of North America lying north of the Columbia River and west of the Rockies
pacific tree frog — a common terrestrial frog, Hyla regilla, of western North America, having a dark stripe along each side of the head.
palace revolution — a challenge to or overthrow of a sovereign or other leader by members of the ruling family or group.
palaeoclimatology — the study of climates of the geological past
paleobiochemistry — the study of biochemical processes that occurred in fossil life forms.
paleoconservative — a person advocating an older, traditional type of conservatism, especially in politics.
papanicolaou test — Pap test.
parachute payment — a payment made to alleviate hardship resulting from a sudden loss of income
parallel computer — parallel processor
parathyroidectomy — the excision of a parathyroid gland.
parcplace systems — (company) A company spun-off from Xerox PARC that developed the original version of VisualWorks.
parted per tierce — tierced.
particle kinetics — Particle kinetics is the study of the movement of particles and the forces that cause this movement.
particle velocity — the velocity of a point in a medium that is undergoing wave motion.
pascal's triangle — a triangular arrangement of the binomial coefficients of the expansion (x + y) n for positive integral values of n.
passenger traffic — number of passengers
paternalistically — the system, principle, or practice of managing or governing individuals, businesses, nations, etc., in the manner of a father dealing benevolently and often intrusively with his children: The employees objected to the paternalism of the old president.
peach bark beetle — a bark beetle, Phloeotribus liminaris, that feeds on and nests in peach and other drupaceous trees.
peacock butterfly — a European nymphalid butterfly, Inachis io, having reddish-brown wings each marked with a purple eyespot
pebbleweave cloth — an irregularly textured material made from twisted yarn
pentachlorophenol — a white, crystalline, water-insoluble powder, C 6 Cl 5 OH, used chiefly in fungicides, disinfectants, and wood preservatives.
per capita income — the total income of an area or country divided by the number of people in that area or country
per procurationem — by one acting as an agent; by proxy.
permanent account — A permanent account is an account which carries its balance and is kept open from year to year.
perpetual spinach — a variety of spinach that keeps producing edible leaves
personal computer — a compact computer that uses a microprocessor and is designed for individual use, as by a person in an office or at home or school, for such applications as word processing, data management, financial analysis, or computer games. Abbreviation: PC.
personal distance — personal space.

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