17-letter words containing e, a, c

on someone's back — criticizing or pestering someone
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.
open-channel flow — Open-channel flow is a liquid flow in a channel, which has a free liquid surface.
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.
oregon crab apple — a shrub or small tree, Malus fusca, of the rose family, of the northwestern coast of North America, having hairy leaves, white flowers, and yellow or green oblong fruit.
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.
orifice discharge — Orifice discharge is a model for calculating how quickly a fluid will come out of a punctured vessel or pipe.
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.
overreach oneself — to fail because of trying to do more than one can
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.
pair of compasses — compass (def 7)
palace revolution — a challenge to or overthrow of a sovereign or other leader by members of the ruling family or group.
palaeoarchaeology — the branch of archaeology concerned with the earliest fossil remains
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.
panama canal zone — Canal Zone.
papanicolaou test — Pap test.
parachute payment — a payment made to alleviate hardship resulting from a sudden loss of income
paradoxical sleep — REM sleep.
parallel computer — parallel processor
paraperiodic acid — the crystalline compound H5IO6, an oxyacid of iodine
parathyroidectomy — the excision of a parathyroid gland.
parcplace systems — (company) A company spun-off from Xerox PARC that developed the original version of VisualWorks.
parmesan (cheese) — a very hard, dry cheese orig. of Italy, made from skimmed cow's milk and usually grated for sprinkling on pasta, soups, etc.
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
passive obedience — unquestioning obedience to authority

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