Serous membrane.—The lining of cavities which have no external opening.
Seton.—An opening in the flesh made and continued by drawing through a skein of silk or linen thread or horsehair.
Siesta.—A midday nap.
Silicea.—Pure flint.
Sitz-bath.—A bath in a sitting position.
Sphincter muscle.—Circular, contracting muscle.
Sperm.—Seed. Fecundating principle.
Sputa.—Matter coughed up from throat and lungs. Phlegm.
Sterility.—Barrenness.
Stertorious.—Stertorous. Deep. Labored. Snoring.