speedletterA kind of military communication that is delivered especially quickly, bypassing the usual delivery system, and does not employ electrical transmission.
speedlightA flashgun that is not fixed to a camera.
speedoA speedometer, particularly one in a race car or other automobile.
speedometerAn instrument located within the dashboard of a vehicle that measures and indicates the current speed of the vehicle.
speedreadTo read quickly, usually at an accelerated rate or unusually high level of speed while maintaining complete comprehension of the material read.
speedrunA playthrough of a computer or video game in which the whole game or a select part of it, such as a single level, is played with the intent of completing it as quickly as possible, optionally with certain prerequisites.
speedshiftA renegotiation of the data rate over a telecommunications link.
speedskateA type of ice skate used in speedskating, with a long blade attached to the sole of the boot via two pillars, at the heel and ball of the foot.
speedskaterAn athlete who specializes in speedskating
speedskierA skier to specializes in speedskiing (a discipline not part of formal alpine skiing, where the skier tries to set the fastest trap speed at a spot or lowest time across a zone with the highest speeds)
speedskiingA discipline of skiing not part of formal alpine skiing, involving skiing as quickly as possible down a straight piste; where the skier tries to set the fastest trap speed at a spot or lowest time across a zone with the highest speeds.
speedsolverA person who solves puzzles, such as the Rubik's Cube, as quickly as possible.
speedwalkingA sport in which people try to walk as fast as possible, subject to the constraint that at least one foot must be on the ground at all time (or else they would be running).
speedwayA form of motorcycle racing on flat (without camber) oval dirt tracks using motorcycles with neither brakes nor gears.
speirochoryThe unintentional introduction of plants into an area by means of contaminated seed.
speiropsA bird of any of the species Zosterops brunneus, Zosterops leucophoeus, Zosterops lugubris, or Zosterops melanocephalus, native to the islands of the Gulf of Guinea and a mountain in Cameroon.
speleothemAny secondary mineral, deposited in a natural cave by the action of water. Includes formations such as stalactites, stalagmites, flowstones, and helictites.
speleothemicRelating to or composed of speleothems.
speleotherapyThe use of the microclimate of salt caves and mines for the treatment of asthma.
spelloutA stage in producing an utterance that comes between syntax and the interface with the phonological form, according to Chomsky's minimalist program.
spellswordA character class or archetype in fantasy stories and role-playing games that is capable of harnessing both magic and martial skills, such as melee weaponry, in combat.
spellthiefIn roleplaying games, a character class with inherent magical ability, allowing them to imitate spells cast by others.