There are multiple definitions:

1. right sacrotransverse position [of fetus](English)

   • fetal position, a term that is not standard in obstetrics; more common are variations of Right Sacro-Posterior (RSP) or Right Sacro-Anterior (RSA), which indicate the baby's sacrum (buttocks) is to the mother's right side, with the sacrum also positioned posteriorly or anteriorly, respectively
   • RSA, RSP
   • Obstetrics, Pregnancy
   • https://oacapps…al_position.htm

2. rubrospinal tract(English)

   • originates in the red nucleus of the midbrain, decussates, and then descends in the lateral aspect of the spinal cord. Major afferents are from the cerebellar and cerebral cortices, and the rubrospinal tract projects to nuclei in the brain stem and cerebellum before reaching the spinal cord. The most important function of the rubrospinal tract is the control of muscle tone in flexor muscle groups. This system seems particularly important in the term newborn because of the impressive flexor tone in the limbs
   • Brain (dys)function, Spine (or spinal cord)
   • https://doi.org…42876-7.00030-2

3. rosuvastatin(English)

   • a novel, synthetic and potent HMG-CoA inhibitor
   • HMG-CoA, HPLC
   • Pharmacology / pharmaceutics
   • https://doi.org/10.1002/bmc.611

4. respiratory stability time(English)

   • its analysis has emerged as a sensitive and specific indicator of worsening heart failure , enabling early clinical exacerbation identification
   • HFrEF
   • Cardiology, Monitoring, Pathology, Respiratory system
   • https://doi.org…1536/ihj.25-214