12-letter words containing e, p, o, s
- archesporial — the primitive cell, or group of cells, that give rise to the cells from which spores are derived.
- archesporium — archespore.
- archipelagos — Plural form of archipelago.
- aristophanes — ?448–?380 bc, Greek comic dramatist, who satirized leading contemporary figures such as Socrates and Euripides. Eleven of his plays are extant, including The Clouds, The Frogs, The Birds, and Lysistrata
- arseno group — the bivalent group −As=As−.
- arsenopyrite — a white or grey metallic mineral consisting of a sulphide of iron and arsenic that forms monoclinic crystals with an orthorhombic shape: an ore of arsenic. Formula: FeAsS
- arthroscopes — Plural form of arthroscope.
- arthrospores — an isolated vegetative cell that has passed into a resting state, occurring in bacteria and not regarded as a true spore.
- aspect ratio — the ratio of width to height of the picture on a television or cinema screen
- assessorship — the occupation, post or duties of a person who assesses, advises, or estimates
- astigmoscope — astigmatoscope.
- atmospherics — Atmospherics are elements in something such as a piece of music or a book which create a certain atmosphere.
- atmospherium — an optical system used to simulate images of atmospheric phenomena, as cloud formations, storms, and day and night, on the inside of a dome.
- attorneyship — The office or profession of an attorney.
- autoexposure — A device that sets the exposure automatically on a camera or other piece of equipment.
- bachelorship — the state of being a bachelor; bachelorhood
- back-stopped — a wall, wire screen, or the like, serving to prevent a ball from going too far beyond the normal playing area.
- bank deposit — money placed in a bank account
- barophoresis — the diffusion of suspended particles at a rate dependent on external forces
- basidiospore — one of the spores, usually four in number, produced in a basidium
- beam compass — an instrument for drawing large circles or arcs, consisting of a horizontal beam along which two vertical legs slide
- bean sprouts — the sprouts of newly germinated mung beans, eaten as a vegetable, esp in Chinese dishes
- besom pocket — an interior pocket with edging or stitching around the opening.
- betting shop — A betting shop is a place where people can go to bet on something such as a horse race.
- bibliopegist — a bookbinder
- bicycle shop — a shop that sells and usually repairs bicycles and bicycle parts
- biopesticide — a naturally occurring or derived substance or an organism that controls pests by nontoxic means
- bird-spotter — a bird-watcher
- black sapote — a tropical American tree, Diospyros digyna, related to the persimmon, having sweet, edible, green fruit that turns black when ripe.
- blastosphere — blastula
- blood sample — an amount of a person's blood taken from their body for use in medical tests
- body repairs — repairs to the bodywork of cars
- bog asphodel — either of two liliaceous plants, Narthecium ossifragum of Europe or N. americanum of North America, that grow in boggy places and have small yellow flowers and grasslike leaves
- booster pump — A booster pump is a pump which is used where pressure is low and needs to be increased.
- boot-scraper — a contraption consisting of an upright metal shape formerly placed outside some houses to enable people to scrape the mud from their boots before going in
- breastplough — a plough driven by the worker's breast, often used to pare turf
- bronchoscope — an instrument for examining and providing access to the interior of the bronchial tubes
- butcher shop — a shop in which meat, poultry, and sometimes fish are sold.
- caesalpinoid — of, relating to, or belonging to the Caesalpinoideae, a mainly tropical subfamily of leguminous plants that have irregular flowers: includes carob, senna, brazil, cassia, and poinciana
- camelopardus — a faint extensive constellation in the N hemisphere close to Ursa Major and Cassiopeia
- cameraperson — a camera operator
- canine corps — a military or law enforcement body which uses dogs for the detection of explosives or drugs or for security, tracking, etc
- cape sounion — Cape, a cape in E central Greece, SE of Athens, at the tip of the Attica peninsula, in W Aegean Sea.
- cape sparrow — a sparrow, Passer melanurus, very common in southern Africa: family Ploceidae
- capillaceous — having numerous filaments resembling hairs or threads
- captiousness — The state of being captious.
- cassiopeia a — a very strong radio and X-ray source in the constellation Cassiopeia, identified as the remnant of a supernova thought to have occurred in the late 17th century
- castile soap — a hard soap made from olive oil and sodium hydroxide
- cataphoreses — Plural form of cataphoresis.
- cataphoresis — electrophoresis