13-letter words containing s, p, e, a
- baby primrose — a tender primrose, Primula forbesii, native to China and Burma, having white, hairy leaves and rose- or lilac-colored flowers with a yellow center.
- back pressure — the pressure that opposes the motion of a piston on its exhaust stroke in an internal-combustion engine
- backspace key — a key on a typewriter or computer keyboard that makes the carriage or cursor move backwards one space
- bacterioscopy — the examination of bacteria with a microscope.
- balanced step — any of a series of staircase winders so planned that they are nearly as wide at the inside of the stair as the adjacent fliers.
- ballistospore — a spore, esp a fungal spore, that is forcefully ejected from its source
- balsam spruce — either of two North American coniferous trees of the genus Picea, P. pungens (the blue spruce) or P. engelmanni
- banana spider — a large, yellowish, tropical crab spider (Heteropoda venatoria) occasionally found in bunches of bananas shipped to the Temperate Zones
- band spectrum — a spectrum consisting of a number of bands of closely spaced lines that are associated with emission or absorption of radiation by molecules
- bandspreading — an additional tuning control in some radio receivers whereby a selected narrow band of frequencies can be spread over a wider frequency band, in order to give finer control of tuning
- barbary sheep — aoudad
- barber's pole — a sign outside a barber's shop consisting of a pole painted with red and white spiral stripes
- barbershopper — a member of a barbershop singing group.
- barley stripe — a disease of barley, characterized by blighted heads and chlorotic, brown, or frayed stripes on the leaves, caused by a fungus, Helminthosporium gramineum.
- baroreceptors — Plural form of baroreceptor.
- barred spiral — a spiral galaxy in which the arms originate at the ends of a bar-shaped nucleus
- barrel-shaped — having the shape of a barrel
- barristership — the office of a barrister
- base hospital — a hospital serving a large rural area
- basic plumage — the plumage assumed by an adult bird at its complete, usually annual, molt.
- basic process — Military. basic training. a soldier or airman receiving basic training.
- basidiospores — Plural form of basidiospore.
- bass response — the response of an audio reproduction system or component to low frequencies
- batch-process — to perform batch processing on (files)
- bay of naples — an inlet of the Tyrrhenian Sea in the SW coast of Italy
- be upstanding — (in a court of law) a direction to all persons present to rise to their feet before the judge enters or leaves the court
- beam splitter — a system that divides a beam of light, electrons, etc, into two or more paths
- beast of prey — any animal that hunts other animals for food
- beaux esprits — bel esprit
- beaux-esprits — plural of bel-esprit.
- bell purchase — a tackle consisting of two standing single blocks, two running single blocks, a fall, and a runner, so arranged that it gives a mechanical advantage of six, neglecting friction.
- best practice — Best practice is the way of running a business or providing a service that is recognized as correct or most effective.
- bias-ply tire — a vehicle tire in which the main plies or cords run across the bead.
- biased sample — a statistical sample in which the items selected share some property which influences their distribution
- birth parents — a child's biological parents, regardless of whether they subsequently bring up the child
- blaise pascal — Blaise [bleyz;; French blez] /bleɪz;; French blɛz/ (Show IPA), 1623–62, French philosopher and mathematician.
- blasphemously — uttering, containing, or exhibiting blasphemy; irreverent; profane.
- blepharoplast — a cylindrical cytoplasmic body in protozoa
- blepharospasm — spasm of the muscle of the eyelids, causing the eyes to shut tightly, either as a response to painful stimuli or occurring as a form of dystonia
- blue copperas — a salt, copper sulfate, CuSO 4 ⋅5H 2 O, occurring naturally as large transparent, deep-blue triclinic crystals, appearing in its anhydrous state as a white powder: used chiefly as a mordant, insecticide, fungicide, and in engraving.
- brachypterous — having very short or incompletely developed wings
- breaker strip — breaker1 (def 4).
- breaker-strip — a person or thing that breaks.
- breast pocket — The breast pocket of a man's coat or jacket is a pocket, usually on the inside, next to his chest.
- breeches part — a male role played by an actress.
- business park — an area specially designated and landscaped to accommodate business offices, warehouses, light industry, etc
- business plan — A business plan is a detailed plan for setting up or developing a business, especially one that is written in order to borrow money.
- bypass engine — a gas turbine in which a part of the compressor delivery bypasses the combustion zone, flowing directly into or around the main exhaust gas flow to provide additional thrust
- caesaropapism — the theory that the state should have authority over the church in ecclesiastical matters; Erastianism
- camerapersons — Plural form of cameraperson.