13-letter words containing s, p, o, i
- ombudsmanship — The position or office of an ombudsman.
- omnipresently — In an omnipresent manner.
- on the parish — receiving parochial relief
- one-upmanship — the art or practice of achieving, demonstrating, or assuming superiority in one's rivalry with a friend or opponent by obtaining privilege, status, status symbols, etc.: the one-upmanship of getting into the president's car pool.
- oneiroscopist — a person who specialises in studying and interpreting dreams
- onomatopoeias — Plural form of onomatopoeia.
- onus probandi — the burden of proof.
- onychophagist — the practice of biting one's nails, especially when done habitually and as a symptom of emotional disturbance.
- open diapason — a full, rich outpouring of melodious sound.
- open position — Music. the arrangement of a chord with wide intervals between the parts.
- open question — question: invites long answer
- open registry — ship registration under a national flag available to all ships regardless of nationality.
- open sandwich — a sandwich served on only one slice of bread, without a covering slice.
- open universe — a model of the universe in which the universe expands forever because there is not enough mass to counteract the expansion by means of gravitational attraction.
- opening hours — Opening hours are the times during which a shop, bank, library, or bar is open for business.
- operativeness — (uncountable) The state or quality of being operative.
- opisthobranch — any gastropod mollusk of the order Opisthobranchia, as the sea slugs, sea butterflies, and sea hares, characterized by a vestigial or absent mantle and shell and two pairs of tentacles.
- opisthography — the practice of writing on the front and back of a parchment or papyrus
- opportunistic — adhering to a policy of opportunism; practicing opportunism.
- opportunities — Plural form of opportunity.
- oppositionary — the action of opposing, resisting, or combating.
- oppositionist — a person who offers opposition; a member of an opposition.
- opprobriously — In an opprobrious manner.
- opsonic index — the ratio of the number of bacteria destroyed by phagocytes in the blood of a test patient to the number destroyed in the blood of a normal individual
- optic chiasma — a site at the base of the forebrain where the inner half of the fibers of the left and right optic nerves cross to the opposite side of the brain.
- optical glass — any of several types of high-quality, homogeneous, color-free glass, as flint or crown glass, having specified refractive properties, used in lenses and other components of optical systems.
- optical mouse — (hardware) Any kind of mouse that uses visible light or infrared to detect changes in its position.
- optical sound — sound recorded on and subsequently played back from an optical or photographic soundtrack, as opposed to a magnetic soundtrack.
- optimizations — Plural form of optimization.
- ora pro nobis — a Latin invocation meaning pray for us
- orchestra pit — musicians' seating in front of stage
- orchestra-pit — a group of performers on various musical instruments, including especially stringed instruments of the viol class, clarinets and flutes, cornets and trombones, drums, and cymbals, for playing music, as symphonies, operas, popular music, or other compositions.
- organotropism — Physiology. the attraction of microorganisms or chemical substances to particular organs or tissues of the body.
- orthographies — Plural form of orthography.
- oscillographs — Plural form of oscillograph.
- oscillography — a device for recording the wave-forms of changing currents, voltages, or any other quantity that can be translated into electric energy, as sound waves.
- oscilloscopes — Plural form of oscilloscope.
- oscilloscopic — Relating to, or carried out by using an oscilloscope.
- osteopetrosis — any of several hereditary diseases characterized by increased bone density.
- osteophytosis — Lb medicine The presence of osteophytes.
- osteoplasties — Plural form of osteoplasty.
- outprocessing — to end a military tour of duty, accompanied by necessary paperwork: All enlisted soldiers out-process as a class.
- outwash plain — Geology. a broad, sloping landform built of coalesced deposits of outwash.
- over-promised — a declaration that something will or will not be done, given, etc., by one: unkept political promises.
- over-shipment — an act or instance of shipping freight or cargo.
- overappraisal — An appraisal that overvalues something.
- overemphasise — (British) alternative spelling of overemphasize.
- overemphasize — to emphasize excessively.
- overexpansion — the act or process of expanding.
- overimpressed — very impressed