What does dialyzing mean?
Dialyzing is the present participle of the verb dialyze, meaning to separate dissolved substances by passing them through a semipermeable membrane that allows small particles to move across while holding back larger ones. Its most familiar application is medical: patients with kidney failure are dialyzing whenever a dialysis machine filters waste products, salts, and excess water from their blood, performing the work their kidneys can no longer manage. The term also has an important laboratory sense, where chemists and biologists speak of dialyzing a solution to remove salts, solvents, or other small impurities from proteins and other macromolecules. Spelled dialysing in British English, the word carries a distinctly clinical, technical tone and appears almost exclusively in medicine, biochemistry, and related sciences. It derives ultimately from the Greek roots dia ('through') and lyein ('to loosen'), making it a close cousin of words like analysis and electrolysis.
verbThe present participle of 'dialyze': to separate small dissolved particles from larger ones in a liquid by means of a semipermeable membrane; especially, to treat a patient's blood artificially using a dialysis machine when the kidneys cannot do so.
- (Medicine) Treating a patient's blood with an artificial kidney machine (hemodialysis) or cleansing the peritoneal cavity (peritoneal dialysis), removing waste products and excess fluid that failing kidneys can no longer clear.
- (Chemistry) Separating smaller molecules or ions from larger ones in solution by allowing them to diffuse through a semipermeable membrane.
"The nurses spent the night dialyzing patients whose kidneys had failed after the poisoning."
"The clinic was dialyzing thirty patients a day before the new unit opened."
"After synthesizing the protein, the team spent hours dialyzing the solution to remove excess salt."
Every time a kidney patient is dialyzing, their machine is quietly repeating the same trick chemists use to purify solutions in the lab — separation by membrane.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dialyzing
Dialyzing comes from dialyze, formed on the Greek roots dia ('through' or 'apart') and lyein ('to loosen or dissolve'). The noun dialysis entered scientific English in the 16th century as a grammatical term before being adopted in the 19th century for chemical separation by membrane, with the verb following. It shares its Greek root with analysis, electrolysis, paralysis, and catalyst, all built around the idea of loosening or breaking apart.
Related word forms
How dialyzing is actually used
In American English the verb is usually spelled 'dialyze' (hence 'dialyzing'), while British English typically uses 'dialyse' ('dialysing'). The word is technical and clinical in register, appearing mostly in medical and laboratory contexts rather than everyday conversation.
Easily confused with dialyzing
'Analyzing' means examining something in detail to understand it, while 'dialyzing' specifically means separating substances through a membrane or treating a patient by artificial filtration.