spectrum
A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.
The autism spectrum.
The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
The set of eigenvalues of a matrix.
Of a bounded linear operator A, the set of scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense.
An abstract object in mathematics created from a commutative ring R and denoted operatorname Spec(R) or operatorname SpecR and said to be the spectrum of R; useful in the study of such rings for providing a geometric object which encodes many of the properties R, and in modern geometry for generalizing the notion of an algebraic variety to that of an affine scheme. Formally, the set of all prime ideals R equipped with the Zariski topology and augmented with a sheaf of rings called the structure sheaf, generated by the B-sheaf on the distinguished open sets D_f which assigns the localization of R at f to each set D_f, regarded as a ring of functions on D_f. See Spectrum of a ring on Wikipedia.Wikipedia
Specter, apparition.
The image of something seen that persists after the eyes are closed.

spectrums
plural of spectrum

specularities
plural of specularity

specularity
The condition of being specular, or the degree to which something is specular

specularization
The act or process of specularizing.

specularizations
plural of specularization

speculation
The faculty of sight.
An act of looking at something; examination, observation.
The process or act of thinking or meditating on a subject.
The act or process of reasoning a priori from premises given or assumed.
A conclusion to which the mind comes by speculating; mere theory; notion; conjecture.
An investment involving higher-than-normal risk in order to obtain a higher-than-normal return.
The act or practice of buying land, goods, shares, etc., in expectation of selling at a higher price, or of selling with the expectation of repurchasing at a lower price; a trading on anticipated fluctuations in price, as distinguished from trading in which the profit expected is the difference between the retail and wholesale prices, or the difference of price in different markets.
A card game in which the players buy from one another trumps or whole hands, upon a chance of getting the highest trump dealt, which entitles the holder to the pool of stakes.
The process of anticipating which branch of code will be chosen and executing it in advance.

speculations
plural of speculation

speculativeness
The quality or state of being speculative.

speculativism
An approach based on speculation rather than any formal method.

speculativity
The quality or state of being speculative.

speech
The ability to speak; the faculty of uttering words or articulate sounds and vocalizations to communicate.
The act of speaking, a certain style of it.
A formal session of speaking, especially a long oral message given publicly by one person.
A dialect, vernacular, or (dated) a language.
Language used orally, rather than in writing.
An utterance that is quoted; see direct speech, reported speech
Public talk, news, gossip, rumour.

speeche
Obsolete spelling of speech.

speeched
simple past and past participle of speech

speeches
plural of speech

speechfright
Alternative form of speech fright.

speechfulness
Quality of being speechful.

speechification
The act of speechifying, making something into a speech

speechifications
plural of speechification

speechlessness
The state of being speechless.

speechlessnesses
plural of speechlessness

speechment
An act of speaking; a speech.

speechments
plural of speechment

speedcore
A very fast type of hardcore techno.

speedfulness
The state, quality, or condition of being speedful.

speediness
The property of being fast; swiftness.

speedlessness
Absence of speed.

speedletter
A kind of military communication that is delivered especially quickly, bypassing the usual delivery system, and does not employ electrical transmission.

speedletters
plural of speedletter

speedometry
The measurement of speed

speedpainting
The act of doing a speedpaint.

speedway
A form of motorcycle racing on flat (without camber) oval dirt tracks using motorcycles with neither brakes nor gears.
A form of bicycle racing on flat (non-banked) oval dirt tracks.
A racetrack venue designated especially for the sport of auto racing.
A racetrack venue designated especially for the sport of auto racing.
A racetrack venue designated especially for the sport of auto racing.
A road for high speed traffic; an expressway.

speedways
plural of speedway

speedwork
physical exercise that concentrates on speed

speedworthiness
The ability to travel at high speed.

speedwriting
Any of various shorthands designed to be written or typed.

spelaeology
Alternative form of speleology.

spelectomy
excision of a renal cavity

speleobiology
The biology of caves

speleogenesis
The formation and development of caves

speleologies
plural of speleology

speleology
The scientific study of caves.
The recreational activity of exploring caves.

speleomycology
The mycology of caves

speleotherapy
The use of the microclimate of salt caves and mines for the treatment of asthma.

spellability
The quality of being spellable.

spellbinder
Something that is spellbinding, that causes rapt attention.

spellbinders
plural of spellbinder

spelldown
A type of spelling bee in which participants sit down as they are eliminated.

spelldowns
plural of spelldown

spellfire
The exchange of shots or explosive blasts of spells (from a wand, staff, etc.) as in magical combat.

spellmaking
The creation of magic spells.

spelloff
Alternative spelling of spell-off.

spellword
A word that acts as a magic spell.

spellwords
plural of spellword

spellwork
Any magical practice involving creating or casting spells, especially new enchantments or spells which are intricate or complex.
The formula or formulation of one or more spells or enchantments; the individual parts constituting such a formulation; the inner workings or structure of a spell.

speluncaphobia
A morbid fear of caves or caverns.

spendability
The quality of being spendable.

spendall
Alternative form of spend-all.

spendathon
A period of intense spending

spendathons
plural of spendathon

spendocracy
A government supporting excessive spending.

spendocrat
A politician or bureaucrat supporting excessive spending.

spendocrats
plural of spendocrat

spendthriftiness
The quality of being spendthrifty.

spendthriftism
The condition of being a spendthrift; profligacy.

spendthriftness
The condition of being a spendthrift; profligacy.

sperges
plural of sperge

spermagglutination
agglutination of sperm

spermarche
The beginning of production of sperm in the testicles at puberty.

spermatidogenesis
The creation of spermatids from secondary spermatocytes during spermatogenesis.

spermatism
Spermism.
The emission of sperm or semen.

spermatization
The process, or the result of spermatizing

spermatizations
plural of spermatization

spermatocrit
An indicator of spermatozoa density based on the proportion of solid packed material in semen after centrifugation.

spermatocrits
plural of spermatocrit

spermatocytogenesis
The production of spermatocytes

spermatogeneses
plural of spermatogenesis

spermatogenesis
The process of sperm production in the testes.
The development of the male elements of a plant, such as antherozoids and pollen grains.

spermatogeny
The generation of spermatozoa.

spermatogonangia
plural of spermatogonangium

spermatogonangium
The structure that carries the spermatogonia

spermatology
The scientific study of sperm.