What does exudation mean?
Exudation is the slow passage of liquid through pores or small openings, whether that liquid be sap bleeding from a tree wound, moisture condensing on a leaf, resin seeping from bark, or serous fluid leaking into damaged tissue. The word names both the process itself and, secondarily, the material that escapes. It belongs chiefly to scientific registers: botanists speak of root exudation when plants release sugars and other compounds into surrounding soil, physicians describe exudation from inflamed membranes, and geologists may use it for fluid escaping rock formations. Derived from the Latin verb sudare, meaning to sweat, the term literally frames such leakage as a form of perspiration. Though rarely heard in casual speech, exudation is precise and useful wherever gradual, passive release of fluid must be described accurately.
nounThe process of slowly oozing out or being discharged through pores or small openings, as of moisture, sap, or fluid; also, the substance that is discharged in this way.
- The act or process of oozing out gradually through pores or small openings (of liquid such as moisture, sap, resin, or bodily fluids).
- The material or substance discharged through this process.
"The exudation of resin from the wounded pine trunk formed hard amber beads along the bark."
"Careful analysis of the root exudation revealed compounds that attract beneficial soil microbes."
"A sticky exudation appeared on the canker sore within hours of the injury."
Used when referring to multiple instances or types of discharge, especially in botanical and medical literature.
"Different root exudations were collected from each seedling over the week."
Exudation comes straight from Latin sudare, 'to sweat' — so when sap weeps from a tree or pus seeps from a wound, the plant or body is essentially sweating.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of exudation
Exudation derives from the Latin verb sudare, 'to sweat', combined with the prefix ex-, 'out of', giving exsudare, 'to sweat out'. The word entered English in the early modern period via scientific Latin, alongside cognates such as the English verb exude and the adjective sudorific. Its Romance-language relatives include French suer and Spanish sudar, both meaning to sweat.
Related word forms
How exudation is actually used
Predominantly a technical or scientific term, used in botany, medicine, and materials science; rare in everyday conversation. In medical contexts it often carries a neutral-to-clinical connotation describing inflammatory fluid, while in botany it is entirely neutral. The related term 'exudate' refers specifically to the substance itself rather than the process.
Easily confused with exudation
Exultation means triumphant joy or rejoicing, while exudation refers to fluid slowly oozing out — the two differ by only a few letters.