14-letter words containing p, e, a, l
- normal pentane — pentane (def 2).
- normal-pentane — a hydrocarbon of the methane series, existing in three liquid isomeric forms.
- nuclear option — the use of or power to use nuclear weapons
- nuclear weapon — an explosive device whose destructive potential derives from the release of energy that accompanies the splitting or combining of atomic nuclei.
- obedient plant — false dragonhead.
- occipital bone — a curved, compound bone forming the back and part of the base of the skull.
- occipital lobe — the most posterior lobe of each cerebral hemisphere, behind the parietal and temporal lobes.
- octave coupler — a mechanism on an organ and on some harpsichords that enables keys or pedals an octave apart to be played simultaneously
- old-line party — either the Liberal Party or the Conservative Party
- omphalocentric — Overly introspective and inclined to navel-gazing.
- omphaloskepsis — contemplation of one's navel as part of a mystical exercise.
- omphaloskeptic — One who contemplates or meditates upon one's navel; one who engages in omphaloscopy.
- on one's plate — waiting to be done or dealt with
- open classroom — a spacious instructional area shared by several groups or classes in elementary school, permitting more individualized, less supervised project learning and movement of pupils from one activity to another.
- open-reel tape — audiotape, usually 1/4 inch (64 mm) wide, wound on a single reel and requiring a separate take-up reel for playing or recording.
- operationalise — Alternative spelling of operationalize.
- operationalism — the doctrine that the meaning of a scientific term, concept, or proposition consists of the operation or operations performed in defining or demonstrating it.
- operationalist — a person who adheres to operationalism
- operationalize — Put into operation or use.
- ophthalmometer — an instrument for measuring the reflection of an image on the surface of the cornea and other capacities of the eye, used chiefly for determining the presence and degree of astigmatism.
- ophthalmometry — the measurement and determination of the eye's defects and powers of refraction
- ophthalmoscope — an instrument for viewing the interior of the eye or examining the retina.
- opt-out clause — a clause that permits signatories to a contract to opt out of particular provisions, or to terminate the contract early
- optical isomer — any of two or more isomers exhibiting optical isomerism.
- oriental poppy — a poppy, Papaver orientale, of Asia, having bristly stems and leaves and showy scarlet, pink, or white flowers, cultivated as an ornamental.
- oriental topaz — a variety of corundum resembling topaz in colour and used as a gemstone
- otaheite apple — a Society Islands tree, Spondias cytherea, of the cashew family, having whitish flowers and yellow, edible, plumlike fruit.
- overcapitalize — to fix the total amount of securities of a corporation in excess of the limits set by law or by sound financial policy.
- overcompliance — excessive compliance
- overcomplicate — to make complex, intricate, involved, or difficult: His recovery from the operation was complicated by an allergic reaction.
- overparticular — precise beyond necessity
- overpopulation — to fill with an excessive number of people, straining available resources and facilities: Expanding industry has overpopulated the western suburbs.
- overspecialize — to specialize to an excessive degree
- ownership flat — a flat owned by the occupier
- package policy — an insurance policy which incorporates cover for different types of risk, such as liability and property
- packed decimal — binary coded decimal
- paddle steamer — a vessel propelled by paddle wheels and driven by steam.
- paddle-wheeler — a steamboat propelled by a paddle wheel
- painted turtle — a freshwater turtle, Chrysemys picta, common in the U.S., having bright yellow markings on the head and neck and red markings on the margin of the carapace.
- palacio valdes — Armando [ahr-mahn-daw] /ɑrˈmɑn dɔ/ (Show IPA), 1853–1938, Spanish novelist and critic.
- palaeanthropic — relating to or denoting the earliest variety of man
- palaebiologist — a person who studies or is an expert in palaebiology
- palaeethnology — the study of prehistoric man
- palaeoclimatic — relating to the climate of a prehistoric age
- palaeoecologic — relating to palaeoecology
- palaeopedology — the study of ancient soils
- paleencephalon — (no longer in technical use) the more primitive part of the brain in the evolutionary development of animals, including all parts except the cerebral cortex and its related structures.
- paleoanthropic — pertaining to prehistoric humans.
- paleobiologist — the branch of paleontology dealing with fossil life forms, especially with reference to their origin, structure, evolution, etc.
- paleoecologist — the branch of ecology dealing with the relations and interactions between ancient life forms and their environment.