| RS | radioscaphoid; random sample; rating schedule; Raynaud syndrome; recipient's serum; rectal sinus; re... |
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| SAC | saccharin; sacrum; screening and acute care; Self-Assessment of Communication [scale]; short-arm cas... |
| SP | sacroposterior; sacrum to pubis; salivary progesterone; schizotypal personality; semi-private [room]... |
| transverse lines of sacrum | One of four ridges that cross the pelvic surface of the sacrum; these mark the positions of the intervertebral disks between the bodies of the five sacral vertebrae in the immature bone. Synonym: lineae transversa ossi sacri. (05 Mar 2000) |
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| lateral part of sacrum | The lateral mass of the sacrum formed by the fused costal elements. Synonym: pars lateralis ossis sacri. (05 Mar 2000) |