rush
Stiff marsh plants of the genus Juncus, having pliant hollow or pithy
stems and small flowers with scale-like perianths (outer envelope of a
flower,).

sago
Powdery starch from the trunks of sago palms; used in Asia as a food
thickener and textile stiffener.

sal-ammoniac
ammonium chloride; white crystalline volatile salt NH4Cl, used in dry
cells and as an expectorant called.

saleratus
Sodium or potassium bicarbonate used as a leavening agent; baking soda.

salicylate
Salt or ester of salicylic acid.

salicylic acid
White crystalline acid, C6H4(OH)(COOH), used to make aspirin and to
treat skin conditions such as eczema.

salol
White crystalline powder, C13H10O3, derived from salicylic acid and used
in plastics, suntan oils, analgesics and antipyretics. Was a trademark.

saltpetre (potassium nitrate, saltpeter, niter, nitre)
(KNO3) used especially as a fertilizer, explosive and a diuretic.