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spinach a leafy green plant widely cultivated as a vegetable.
spinal of, pertaining to, affecting, or near the spine or spinal cord. [3 definitions]
spinal anesthesia partial or complete anesthesia produced by injecting an anesthetic directly into the spinal cord.
spinal column in vertebrate animals, the row of vertebrae linked together to form the axis of the skeleton and protect the spinal cord; spine; backbone.
spinal cord the thick cord of nerve tissue that extends through the inner canal of the spinal column from the base of the brain to the end of the spine of any vertebrate animal.
spindle a thin notched rod with tapered ends, on which thread is twisted and wound as it is spun. [9 definitions]
spindlelegs long thin legs. [2 definitions]
spindly long or tall, slender, and usu. frail or weak-looking.
spin doctor (slang) a representative, esp. of a politician, who gives a favorable interpretation for utterances and decisions.
spindrift spray blown from waves by the wind.
spine the backbone in vertebrates; spinal column. [4 definitions]
spinel any of a group of hard, crystalline mineral oxides containing magnesium and aluminum, the red variety of which is used as a gem.
spineless having no courage, conviction, or will power; irresolute. [3 definitions]
spinet a small, low, upright piano. [3 definitions]
spin kick a martial arts move in which a person jumps spinning into the air to deliver a kick.
spinless combined form of spin.
spinnaker a large, triangular, usu. brightly colored or striped sail set on a long spar and swung out opposite the mainsail when the wind is coming from behind the boat, used esp. in sailboat and yacht racing.
spinner a person or thing that spins. [4 definitions]
spinneret an organ in spiders and caterpillars that produces the silky thread for webs and cocoons. [2 definitions]
spinning the act or process of making thread or yarn from fibers or filaments. [2 definitions]
spinning jenny an early spinning machine equipped with several spindles for spinning a number of threads at the same time.