single-dose

The compound adjective "single-dose" is a modern formation in scientific and medical English, combining two words of distinct ancient lineages. "Single" traces back to the Latin singulus, meaning one or individual, which itself may derive from the Proto-Indo-European root sem- (one). "Dose" entered English via French and Latin from the Greek dosis, meaning a giving or a portion, originating from the verb didonai (to give). The logic of the compound is transparently literal: a "single giving" or "one portion," directly describing a therapeutic regimen completed in one administration, contrasting with multi-dose courses. This precise terminology evolved to meet the needs of modern pharmacology and public health communication.

Structure: single (one) + dose (measured quantity) - single: From Latin singulus (one, individual). Functional role: Adjective/quantifier meaning "one". - dose: From Greek dosis (a giving, a portion). Functional role: Noun meaning a measured quantity of a therapeutic agent.