R. — Recipe, take; but for this the old authors, and the French to this day, use this sign , being the old heathen invocation to Jupiter, seeking his blessing upon the formula, equivalent to the usual invocation of the poets and of Mahomedan authors, or the Laus Deo with which book-keepers and merchants clerks formerly began their books of account and invoices, a practice not yet quite extinct.
Red. in pulv. — Redactus in pulverem, powdered.
Redig. in pulv. — Redigatur in pulverem, it should be reduced to powder.
Reg. umbil. — Regio umbilici, the parts near the navel.
Repet. — Repetatur, it should be continued; repetantur, they should be continued.
S. A. — Secundum artem, according to art.
Semidr. — Semidrachma, half a drachm.
Semih. — Semihora, half an hour.
Sesunc. — Sesuncia, an ounce and a half.
Sesquih. — Sesquihora, an hour and a half.
Si n. val. — Si non valeat, if it does not answer.
Si op. sit. — Si opus sit, if need shall be.
Si vir. perm. — Si vires permittant, if the strength will allow.
Sign. n. pr. — Signetur nomine proprio, write upon it the usual name, not the trade name.
Sing. — Singulorum, singularum, of each.
S. S. S. — Stratum super stratum, layer upon layer.
Ss. — Semi, a half.
St. — Stet, it should stand; stent, they should stand.
Sub fin. cod. — Sub finem coctionis, when the boiling is nearly finished.
Sum. tal. — Sumat talem, the patient should take one like this.
S. V. — Spiritus vinosus, ardent spirits of any strength.
S. V. R. — Spiritus vinosus rectificatus, spirit of wine.
S. V. T. — Spiritus vinosus tenuis, proof spirit, or half and half spirit of wine and water.
Temp. dext. — Tempori dextro, to the right temple.
T. O. — Tinctura opii, tincture of opium; generally confounded with laudanum, which is properly the wine of opium.
T. O. C. — Tinctura opii camphorata, paregoric elixir.