Singultus. Continued hiccough.

Sinus. An elongated cavity or abscess, having a small orifice.

Situ. Situation.

Slough. A dead or mortified portion.

Solution. The preparation made by dissolving a solid in a liquid.

Speculum. An instrument for dilating a passage or facilitating an examination.

Sphincter. A circular muscle for contracting a natural opening.

Spinal Cord. A continuation of the brain through the vertebral column.

Sporadic. Occurring singly or scattered.

Stercoraceous. Mixed with fæcal matter.