Spasm (spazm). A sudden, violent, involuntary rigid contraction due to
muscular contraction.
Speculum (spek'u-Ium). An instrument for dilating the opening of a passage
or cavity of the body to view the interior.
Specific (spe-sif 'ik). A remedy especially indicated for any particular
disease.
Sphincter (sfingk'ter). A ring-like muscle which closes a natural orifice.
Spinal Cord (spi'nal). The cord-like structure contained in the spinal canal.
Spleen (spleen). One of the so-called ductless glands.
Sporadic (spo-rad'ik). Occurring here and there, scattered.
Squamous (skwa'-mus). Scaly or plate-like.
Stertorous (ster'torus). Snoring. breathing.
Sternum (ster'num). Breast bone.