12-letter words containing e, s, p, o
- nonpurposive — lacking purpose
- nonresponder — something or someone that does not respond
- nonspherical — not spherical
- nonsponsored — Not sponsored.
- normed space — any vector space on which a norm is defined.
- northern spy — an American variety of red-striped apple that ripens in autumn or early winter.
- nosey parker — a persistently nosy, prying person; busybody.
- nucleocapsid — the nucleic acid core and surrounding capsid of a virus; the basic viral structure.
- nucleophiles — Plural form of nucleophile.
- numbers pool — Also called numbers, numbers game, numbers racket. an illegal daily lottery in which money is wagered on the appearance of certain numbers in some statistical listing or tabulation published in a daily newspaper, racing form, etc.
- obcompressed — compressed or flattened in a way opposite to the usual, as back to front instead of side to side.
- obreptitious — having the characteristics of acquiring something by deceitful means
- observership — someone or something that observes.
- obstreperate — to be extremely noisy or to create a resounding din
- obstreperous — resisting control or restraint in a difficult manner; unruly.
- octapeptides — Plural form of octapeptide.
- octopetalous — containing or consisting of eight petals
- octosepalous — having or consisting of eight sepals
- oesophagitis — Alternative spelling of esophagitis.
- office space — part of a building for business use
- 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)
- oil pressure — force that keeps engine lubricated
- oilseed rape — Oilseed rape is a plant with yellow flowers which is grown as a crop. Its seeds are crushed to make cooking oil.
- oligopsonies — Plural form of oligopsony.
- oligospermia — (medicine) Low volume of semen.
- olympic-size — of the dimensions or length prescribed for the Olympic Games and other major athletic competitions: an Olympic-size speed-skating oval.
- ombudsperson — ombudsman (def 2).
- omnipresence — present everywhere at the same time: the omnipresent God.
- on one's pat — alone; on one's own
- 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.
- one's pigeon — one's special concern, or business
- onion-shaped — bulb-shaped; shaped like an onion
- 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.
- opera singer — a professional singer of opera
- 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.
- opposite sex — man if woman, woman if man
- oppositeness — The state or condition of being opposite.
- oppressional — Exhibiting or relating to oppression.
- oppressively — burdensome, unjustly harsh, or tyrannical: an oppressive king; oppressive laws.
- optogenetics — (genetics) A science that combines optics and genetics to probe neural 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.