What does distend mean?
To distend is to swell outward beyond normal size because of pressure from within — the effect of gas filling the intestines, blood engorging a vessel, or air inflating a balloon. The word works both intransitively ("his stomach distended") and transitively ("the gas distended the bag"), though the participial adjective "distended" is by far its most common form in practice. Distend belongs chiefly to formal registers: medicine, biology, and careful descriptive prose. Doctors speak of distended abdomens and distended bladders; naturalists describe how certain frogs distend their throats to croak, or how snakes distend their jaws to swallow large prey. Its connotation is clinical rather than emotional — it names a physical state precisely, without the alarm carried by "bloated" or the drama of "engorged." Derived from Latin "distendere," meaning to stretch apart, it shares its root with "extend," "tension," and "tendon." For writers who want an exact, slightly scientific term for swelling from within, distend is the precise choice.
verbTo swell or cause something to swell outward beyond its normal size by pressure from within; to become expanded or bloated.
- To swell or become enlarged by pressure from within (e.g., a distended abdomen).
- To cause something to swell or expand in this way.
"The snake's jaws distend as it swallows its prey whole."
"The patient's abdomen was visibly distended after the surgery."
"Overeating caused his stomach to distend uncomfortably."
A snake's jaws can distend so dramatically that it swallows prey far wider than its own head — the same word doctors use for a bloated belly.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of distend
Distend comes from Latin "distendere," formed from the prefix "dis-" (apart) plus "tendere" (to stretch), so its literal sense is "to stretch apart or out." It entered English in the late 16th century, initially carrying the sense of stretching something out, before settling into its modern meaning of swelling under internal pressure. It shares its Latin root with "extend," "tension," "tendon," and "tent," all descendants of "tendere."
Related word forms
How distend is actually used
Distend is largely formal and appears most often in medical, scientific, and descriptive writing rather than casual conversation. It carries a clinical or slightly technical tone, so in everyday speech speakers usually prefer "bloat" or "swell." It is most commonly used of body parts — especially the abdomen or blood vessels — but applies to anything swollen by internal pressure.
Easily confused with distend
"Extend" means to stretch out or make longer in space or time, while "distend" means to swell or balloon outward from internal pressure.