sodium chloride. Common table salt.
sodium hydroxide. Caustic soda. Used for its caustic effects.
sodium sulphate. Colorless crystals. Glauber’s salt; a purgative.
sodium urate. The substance found in gouty nodes; chalk-stone.
spasm. An involuntary convulsive muscular contraction.
spirillum. A genus of spirillaceae containing rigid cells with polar tufts.
spirochaeta pallida. The specific organism of syphilis.
splint. An apparatus for fixating a joint.
spontaneous. Occurring without external stimulation.
spores. Reproductive bodies of cryptogams.