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speedball (slang) a mixture of cocaine and heroin or morphine, usu. injected. [2 definitions]
speedboat a high-speed motorboat.
speed bump a raised concrete or asphalt ridge, as in a parking lot, to discourage speeding.
speed limit the highest legal driving speed in a state or on a road or portion of a road.
speedometer an instrument that measures the speed of a moving vehicle. [2 definitions]
speed skate an ice skate with a particularly long blade, used in racing. [2 definitions]
speed skating a competitive ice-skating sport, in which skaters wear speed skates and race, usu. around an oval track.
speedster (informal) a very fast driver or vehicle; speeder. [2 definitions]
speed trap a stretch of road where police officers and radar devices are concealed in order to catch speeders.
speed-up an increase in speed; acceleration. [2 definitions]
speed up to go or cause to go faster.
speedway a race track for automobiles and motorcycles. [2 definitions]
speedwell any of various wild plants, bushes, or small trees that bear clusters of short-lived blue flowers.
speedy characterized by swift movement or rapidity of accomplishment.
speleology the scientific exploration, examination, and study of caves.
spell1 to name or write the letters of (a word) in order. [4 definitions]
spell2 a word, phrase, or the like used to bewitch or enchant; charm; incantation. [3 definitions]
spell3 a brief, undefined period or interval of time. [4 definitions]
spellbind to hold fascinated, as though under a spell; enchant.
spellbinder someone or something that holds attention as if by a spell, such as a compelling orator or entertainer, or a fascinating book.
spellbound held in fascinated attention, as if by a spell.