17-letter words containing o, p, e, n, i
- business envelope — an envelope into which standard-size (81⁄2″ × 11″) letterhead stationery can be put with only two folds
- california privet — a privet, Ligustrum ovalifolium, of the olive family, native to Japan, having glossy, oval leaves and long clusters of white flowers, widely used for hedges in the U.S.
- canadian pondweed — a North American aquatic plant, Elodea (or Anacharis) canadensis, naturalized in Europe, having crowded dark green leaves: family Hydrocharitaceae. It is used in aquariums
- canine parvovirus — a highly contagious viral disease of dogs characterized by vomiting, haemorrhagic diarrhoea, depression, and, in severe cases, death
- capital allowance — the practice of allowing a certain amount of money spent by a company on fixed assets to be taken off the profits of the company before tax is imposed
- carbon disulphide — a colourless slightly soluble volatile flammable poisonous liquid commonly having a disagreeable odour due to the presence of impurities: used as an organic solvent and in the manufacture of rayon and carbon tetrachloride. Formula: CS2
- carbon microphone — a microphone in which a diaphragm, vibrated by sound waves, applies a varying pressure to a container packed with carbon granules, altering the resistance of the carbon. A current flowing through the carbon is thus modulated at the frequency of the sound waves
- cardiac tamponade — tamponade (def 2).
- cardiac-tamponade — Medicine/Medical. the use of a tampon, as to stop a hemorrhage.
- carolina allspice — any of a genus (Calycanthus) of hardy shrubs (family Calycanthaceae) of a dicotyledonous order (Laurales) of plants, bearing reddish-brown, sweet-smelling flowers
- carolina parakeet — an extinct New World parakeet, Conuropsis carolinensis, that ranged into the northern U.S., having yellowish-green plumage with an orange-yellow head.
- cartesian product — the set of all ordered pairs of members of two given sets. The product A × B is the set of all pairs <a, b> where a is a member of A and b is a member of B
- centripetal force — a force that acts inwards on any body that rotates or moves along a curved path and is directed towards the centre of curvature of the path or the axis of rotation
- chelsea pensioner — an old ex-soldier resident in the Chelsea Royal Hospital
- chest compression — Chest compression is the act of applying pressure to someone's chest in order to help blood flow through the heart in an emergency situation.
- child development — the biological and psychological developments in human beings between birth and the end of adolescence
- chincoteague pony — a wild pony found on certain islands off the Virginia coast, apparently descended from Moorish ponies shipwrecked in this vicinity in the 16th century.
- chord progression — movement from chord to chord
- clifden nonpareil — a handsome nocturnal moth, Catocala fraxini, that is brown with bluish patches on the hindwings: related to the red underwing
- clipperton island — an uninhabited atoll in the E Pacific SW of Mexico, under French administration. Area: 6 sq km (2.3 sq miles)
- close corporation — a small private limited company
- close parenthesis — right parenthesis
- close punctuation — punctuation in which many commas, full stops, etc, are used
- closed-captioning — (of a television program, film, or video) distributed with synchronized transcription of speech and written descriptions of other relevant audio elements, as for the hearing-impaired, that are visible only when the option to display them is selected. Abbreviation: CC.
- cognitive therapy — a form of psychotherapy in which the patient is encouraged to change the way he or sees the world and himself or herself: used particularly to treat depression
- collodion process — wet plate process.
- colour separation — the division of a coloured original into cyan, magenta, yellow, and black so that plates may be made for print reproduction. Separation may be achieved by electronic scanning or by photographic techniques using filters to isolate each colour
- come to handgrips — to engage in hand-to-hand fighting
- commuter airplane — air taxi.
- companionableness — The state or quality of being companionable.
- compartmentalised — Simple past tense and past participle of compartmentalise.
- compartmentalized — separated into several discrete areas
- compartmentalizes — Third-person singular simple present indicative form of compartmentalize.
- compass deviation — deviation (def 4).
- compassionateness — The state or quality of being compassionate.
- complementariness — forming a complement; completing.
- complementarities — Plural form of complementarity.
- complimentariness — The state or quality of being complimentary.
- composite volcano — a large, steep volcano built up of alternating layers of lava and ash or cinders.
- composite-volcano — a large, steep volcano built up of alternating layers of lava and ash or cinders.
- composting toilet — a human waste disposal system that utilizes a waterless or low-flush toilet in conjunction with a tank in which aerobic bacteria break down the waste.
- compound interest — Compound interest is interest that is calculated both on an original sum of money and on interest which has previously been added to the sum. Compare simple interest.
- compound interval — an interval that is greater than an octave, as a ninth or a thirteenth.
- comprehensibility — capable of being comprehended or understood; intelligible.
- comprehensiveness — of large scope; covering or involving much; inclusive: a comprehensive study of world affairs.
- compression ratio — the ratio of the volume enclosed by the cylinder of an internal-combustion engine at the beginning of the compression stroke to the volume enclosed at the end of it
- computer confetti — (jargon) (Or "chad") A common term for punched-card chad, which, however, does not make good confetti, as the pieces are stiff and have sharp corners that could injure the eyes.
- computer printout — a document that is printed from a computer file
- computer terminal — a keyboard and computer monitor connected to a computer
- conceptualisation — The act of conceptualising, or something conceptualised.