A pharmacist; specifically one who has passed the higher examination of the Pharmaceutical Society. Now also: a scientist who works in a laboratory developing medicinal drugs.
The 1868 Pharmacy Act instituted two levels of pharmacist, the higher of which was that of pharmaceutical chemist. As a result of the Pharmacy Act of 1953 the lower category of chemist and druggist was abolished and the title of pharmaceutical chemist was applied to all.
Early 19th century; earliest use found in Monthly Gazette Health. From pharmaceutical + chemist.