12-letter words containing p, o, t, s
- octopetalous — containing or consisting of eight petals
- octosepalous — having or consisting of eight sepals
- oesophagitis — Alternative spelling of esophagitis.
- offset paper — paper used in a printing method in which the impression is made onto an intermediate surface, such as a rubber blanket, which transfers it to the paper
- offset press — a printing press used in the offset process, whereby a printing the impression is made onto an intermediate surface, such as a rubber blanket, which transfers it to the paper
- oil deposits — reserves of petroleum found underground (or under the sea)
- oligopolists — Plural form of oligopolist.
- on one's pat — alone; on one's own
- on sb's part — If you talk about a feeling or action on someone's part, you are referring to something that they feel or do.
- on the ropes — a strong, thick line or cord, commonly one composed of twisted or braided strands of hemp, flax, or the like, or of wire or other material.
- on the stump — If politicians are on the stump, they are campaigning for an election.
- opalescently — In an opalescent manner.
- open cluster — a comparatively young, irregularly shaped group of stars, often numbering up to several hundred, and held together by mutual gravitation; usually found along the central plane of the Milky Way and other galaxies.
- open desktop — (operating system, product) A Motif-based graphical interface from the Santa Cruz Operation (SCO), built over their Unix environment, part of the ACE initiative. Also known as "Open DeathTrap".
- open slather — to spread or apply thickly: to slather butter on toast.
- operationism — the doctrine that the meaning of a scientific term, concept, or proposition consists of the operation or operations performed in defining or demonstrating it.
- operatorless — Without an operator (person who operates); fully automatic.
- operatorship — (in the oil and gas industries) the right to operate a well, field, or other oil source.
- ophiolatrous — of, relating to, or practising snake-worshipping
- ophiophilist — a person who loves snakes
- ophthalmitis — ophthalmia.
- opinionators — Plural form of opinionator.
- opisthodomos — Also called posticum. a small room in the cella of a classical temple, as for a treasury.
- opisthograph — a manuscript, parchment, or book having writing on both sides of the leaves.
- opisthotonic — of or relating to opisthotonos
- opisthotonos — Spasm of the muscles causing backward arching of the head, neck, and spine, as in severe tetanus, some kinds of meningitis, and strychnine poisoning.
- opportunists — Plural form of opportunist.
- opposability — capable of being placed opposite to something else: the opposable thumb of primates.
- opposite sex — man if woman, woman if man
- oppositeness — The state or condition of being opposite.
- oppositional — the action of opposing, resisting, or combating.
- opsonisation — Alternative form of opsonization.
- opsonization — to increase the susceptibility of (bacteria) to ingestion by phagocytes.
- optic chiasm — 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 disc — Also, optical disc. Also called laser disk. a grooveless disk on which digital data, as text, music, or pictures, is stored as tiny pits in the surface and is read or replayed by a laser beam scanning the surface.
- optical disk — Also, optical disc. Also called laser disk. a grooveless disk on which digital data, as text, music, or pictures, is stored as tiny pits in the surface and is read or replayed by a laser beam scanning the surface.
- optimisation — Alternative spelling of optimization.
- optimistical — disposed to take a favorable view of events or conditions and to expect the most favorable outcome.
- optoacoustic — relating to the relationship between light and sound
- optogenetics — (genetics) A science that combines optics and genetics to probe neural circuits.
- optoisolator — A device that transmits a signal optically between two isolated electronic circuits.
- optometrists — Plural form of optometrist.
- oreopithecus — a genus of fossil primate from the Miocene coal deposits of Italy, formerly considered to be a possible hominid.
- ornithopters — Plural form of ornithopter.
- ornithoscopy — divination from the observation of birds
- orthopaedics — (used with a singular verb) the medical specialty concerned with correction of deformities or functional impairments of the skeletal system, especially the extremities and the spine, and associated structures, as muscles and ligaments.
- orthopaedist — Alternative spelling of orthopedist.
- orthopterans — Plural form of orthopteran.
- orthopterist — someone who studies the Orthoptera
- orthopterous — belonging or pertaining to the Orthoptera, an order of insects, including the cockroaches, mantids, walking sticks, crickets, grasshoppers, and katydids, characterized by leathery forewings, membranous hind wings, and chewing mouthparts.