dialysis

noun

di·​al·​y·​sis dī-ˈa-lə-səs 

plural dialyses dī-ˈa-lə-ˌsēz 

1

: the separation of substances in solution by means of their unequal diffusion through semipermeable membranes

especially : such a separation of colloids from soluble substances

2

: the process of removing blood from an artery (as of a patient affected with kidney failure), purifying it by dialysis, adding vital substances, and returning it to a vein

called also hemodialysis

dialytic

ˌdī-ə-ˈli-tik 

adjective

Examples of dialysis in a Sentence

Recent Examples on the Web

Debora Kapisha, a medical-surgical nurse who works with dialysis patients, has a pending asylum case, according to colleagues. — Nicole Acevedo, NBC news, 7 Aug. 2026

Several vendors expressed interest in the job, but ICE said a formal competition would take months and the lack of a way to process claims could delay necessary medical care, such as dialysis, prenatal care and chemotherapy. — Andrea Castillo, Los Angeles Times, 6 Aug. 2026

Jaxon was born with Eagle-Barrett Syndrome, which Amy says required him to need a kidney transplant and, at 6 months old, start peritoneal dialysis, which is a way to remove waste from the blood as a treatment for kidney failure, per Mayo Clinic. — Chiara Kim, PEOPLE, 6 Aug. 2026

DaVita — Shares tanked around 19% despite the kidney dialysis provider reporting better-than-expected results for the second quarter. — Davis Giangiulio, CNBC, 5 Aug. 2026

Word History

Etymology

New Latin, from Greek, separation, from dialyein to dissolve, from dia- + lyein to loosen — more at lose

First Known Use

1861, in the meaning defined at sense 1

Rhymes for dialysis

• analysis
• paralysis
• cryptanalysis
• urinalysis
• electrodialysis
• haemodialysis
• hemodialysis
• microanalysis
• psychoanalysis

Kids Definition

dialysis

noun

di·​al·​y·​sis dī-ˈal-ə-səs 

plural dialyses -ə-ˌsēz 

1

: the separation of substances in solution by means of their unequal diffusion through membranes with pores of a specified maximum size

especially : such a separation of colloids from dissolved substances

2

: the process of removing blood from an artery (as of a patient with failing kidneys), purifying it by dialysis, and returning it to a vein

Medical Definition

dialysis

noun

di·​al·​y·​sis dī-ˈal-ə-səs 

plural dialyses -ˌsēz 

1

: the separation of substances in solution by means of their unequal diffusion through semipermeable membranes

especially : such a separation of colloids from soluble substances

2

: either of two medical procedures to remove wastes or toxins from the blood and adjust fluid and electrolyte imbalances by utilizing rates at which substances diffuse through a semipermeable membrane:

a

: the process of removing blood from an artery (as of a kidney patient), purifying it by dialysis, adding vital substances, and returning it to a vein

called also hemodialysis

b

: a procedure performed in the peritoneal cavity in which the peritoneum acts as the semipermeable membrane

called also peritoneal dialysis

dialytic

ˌdī-ə-ˈlit-ik 

adjective