17-letter words containing a, c, f

of its own accord — If something happens of its own accord, it seems to happen by itself, without anyone making it happen.
off-site facility — An off-site facility is a facility which is not at the main industrial or commercial site.
off-year election — (in the US) an election held in a year when a presidential election does not take place
office automation — a method or system of using automated or electronic equipment, as word processors and computers, in the operations of an office.
office by example — (language) (OBE) A sequel to QBE, described in publications by Moshe Zloof of IBM in the early 1980s but apparently never implemented.
official receiver — an officer appointed by the Insolvency Service to receive the income and manage the estate of a bankrupt pending the appointment of a trustee in bankruptcy
old norman french — Norman French (sense 1)
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.
open-channel flow — Open-channel flow is a liquid flow in a channel, which has a free liquid surface.
orifice discharge — Orifice discharge is a model for calculating how quickly a fluid will come out of a punctured vessel or pipe.
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
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)
passenger traffic — number of passengers
peacock butterfly — a European nymphalid butterfly, Inachis io, having reddish-brown wings each marked with a purple eyespot
performance bonus — a monetary bonus paid to staff who have performed well in their job
performance drugs — the drugs that are taken illegally by athletes to enhance their sporting performance
petrol filler cap — a small cover that goes over the hole in a vehicle into which you put petrol
phenylformic acid — benzoic acid.
point of purchase — designating or in use at a retail outlet where an item can be purchased; point-of-sale: point-of-purchase displays to entice the buyer.
point-of-purchase — designating or in use at a retail outlet where an item can be purchased; point-of-sale: point-of-purchase displays to entice the buyer.
political refugee — a person who has fled from a homeland because of political persecution.
port orford cedar — a tall tree, Chamaecyparis lawsoniana, of coastal Oregon, having flattened, scalelike foliage and wood highly valued as timber.
positive feedback — Electronics. the process of returning part of the output of a circuit, system, or device to the input, either to oppose the input (negative feedback) or to aid the input (positive feedback) acoustic feedback.
pre-configuration — the relative disposition or arrangement of the parts or elements of a thing.
pre-modifications — an act or instance of modifying.
pre-qualification — a quality, accomplishment, etc., that fits a person for some function, office, or the like.
prefect apostolic — the administrator, usually below the rank of bishop, in charge of a prefecture apostolic.
preference shares — a share of preferred stock.
pro forma invoice — an invoice issued before an order is placed or before the goods are delivered giving all the details and the cost of the goods
probation officer — an officer who investigates and reports on the conduct of offenders who are free on probation.
procurator fiscal — In the Scottish legal system, the procurator fiscal is a public official who puts people on trial.
proficiency badge — an insignia or device granted by the Girl Scouts and worn especially on a uniform to indicate special achievement.
proof of coverage — A policyholder's proof of coverage is a document from an insurer stating that they have insurance coverage.
proof of purchase — a document, such as a receipt, etc, that proves that you have purchased or bought something
proof-of-purchase — a sales slip, label, box top, or other item associated with a product that is presentable as evidence of actual purchase, as for claiming a refund or rebate.
protection factor — a figure representing the relative degree of protection from the sun's rays afforded by a particular sunscreen
protective tariff — a tariff levied on imports to protect the domestic economy rather than to raise revenue
purple of cassius — a purple pigment precipitated as a sol by the interaction of gold chloride and a solution of stannic acid and stannous chloride: used chiefly in the manufacture of ruby glass, ceramic glazes, and enamels.
pyrosulfuric acid — a strong, crystalline acid, H2S2O7, prepared commercially as a heavy, oily, fuming liquid: used in making explosives and dyes, as a sulfating agent, etc.
quadratic formula — the formula for determining theroots of a quadratic equation from its coefficients: .
qualified success — If you describe something as a qualified success, you mean that it is only partly successful.
rational function — a function that can be written as the quotient of two polynomials with integral coefficients.
receding forehead — a forehead which slopes backwards
recursion formula — a formula for determining the next term of a sequence from one or more of the preceding terms.
reduction formula — a formula, such as sin (90° ± A) = cos A, expressing the values of a trigonometric function of any angle greater than 90° in terms of a function of an acute angle

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