What does dropwise mean?
"Dropwise" is an adverb meaning in the form of separate drops — that is, added or dispensed one drop at a time rather than in a stream or all at once. It is overwhelmingly a technical term, appearing most frequently in chemistry laboratory procedures, where adding one reagent "dropwise" to another controls the rate of reaction, manages heat release, or prevents unwanted side reactions. A typical instruction might read: "Add the oxidizing agent dropwise to the stirred solution." The word also appears in pharmacology and medicine, for instance when describing eyedrops administered dropwise. Formed transparently from "drop" plus the suffix "-wise" (meaning "in the manner of"), it is instantly understandable even on first encounter. Though rare outside scientific registers, it is precise, compact, and unambiguous — exactly what procedural writing demands — making it a small but genuinely useful piece of vocabulary for anyone reading lab protocols or pharmaceutical directions.
adverbIn the form of individual drops; drop by drop, especially when adding one liquid slowly to another.
- Added or occurring in the form of individual drops, one at a time — used chiefly in laboratory and technical contexts to describe the slow addition of a liquid to another substance.
"The sulfuric acid was added dropwise to the cooled solution, since the reaction is violently exothermic if rushed."
"Add the sodium hydroxide solution dropwise until the indicator just changes color."
"The medication was delivered dropwise into each eye, twice daily."
Chemistry lab manuals use 'dropwise' so often that it may be one of the few words you'll read hundreds of times in a textbook yet almost never hear in conversation.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dropwise
"Dropwise" is an English compound formed from the Old English-derived noun "drop" (from Proto-Germanic *drupiz) combined with the adverbial suffix "-wise", from Old English "-wīse" meaning "manner, way". The suffix produces many parallel formations such as "likewise", "clockwise", and "otherwise", so "dropwise" simply means "in the manner of drops". It arose in English technical writing, becoming established particularly in nineteenth-century chemistry literature as experimental procedure manuals standardized their language.
How dropwise is actually used
Primarily a technical term found in chemistry, pharmacology, and laboratory instructions; rare in everyday speech. It functions only adverbially — English does not use 'dropwise' as an adjective or noun. It typically follows the verb it modifies ('was added dropwise'), though it can precede it ('carefully dropwise addition') mainly in noun-phrase constructions such as 'dropwise addition'.