is the practice of squeezing one's body into a small, knee-high box or other container which appears to be much too small for a person to fit in.
en.wikipedia.org/wiki/Contortion
A gastroenterologist deals with diseases and problems in the stomach and intestines along with associated organs. "Gastro" means "Stomach" and "Enterum" refers to the intestinal tract. Gastro-Enterum . . . gastro-enterology . . . gastroenterologist.
Intestines are called intestines in medical terms. The medical terminology combining form meaning intestines is entero-
Gastroenterology is the branch of medical science associated with evaluating and treating rectal bleeding, as it involves the study of the digestive system, including the colon and rectum. Patients with rectal bleeding may undergo procedures such as colonoscopies and endoscopies to identify the source of the bleeding and determine appropriate treatment.
There are several hundred. Here are some: earmarking earthbound earthlings earthquake earthworks earthworms easterlies eastwardly eavesdrops ebullience eccentrics ecclesiast echinoderm ecological ecologists economical economists economizes ecosystems ectodermal ecumenical edentulous editorials editorship effectuate effeminate effervesce effeteness efficacies efficiency effortless effrontery effusively egocentric egoistical eighteenth eightieths ejaculated elaborates elasticity elderberry electicism electively electorate electrical electrodes electronic elementary eliminated eliminator ellipsoids elliptical elongating eloquently elucidated eluctation emaciation emanations emancipate emasculate embalmment embankment embezzlers embittered emblazoned embodiment emboldened embrasures embroidery embroiling emendation emeraldine emergences emigration emissaries emollients empaneling empathetic empathized emphasizes emphatical empiricism employment empowering emulsified enactments enamelling encampment encapsules encasement enchanting enchiladas encircling enclosures encounters encouraged encroached encrusting encrypting encumbered encyclical endangered endearment endeavored endodermis endorsable endoscopic endowments energizing enervating enfeebling enfettered enforcible engagement engagingly engendered engineered engravings engrossing engulfment enigmatist enjoyments enlightens enlistment enlivening enormously enragement enraptured enrichment enrollment enshrining enshrouded ensnarling ensorceled entangling enterology enterprise entertains enthralled enthusiasm enticement enticingly entombment entomology entourages entraining entrancing entrapment entreaties entrenched entrusting enumerable enumerated enunciated enveloping envisaging envisioned epauletted ephemerous epicardium epicenters epicondyle epicureans epididymis epiglottis epileptics epiphanies epiphyseal episcopacy epistolary epithelial epitomized equability equalizing equangular equanimity equatorial equestrian equivalent equivocate eradicated ergonomics ergosterol erotically eructation eruptional eruptively escalation escalators escarpment escutcheon esophageal espadrille especially essentials estimation estivation eternalize ethereally ethnically ethylamine etiolation etiologies eucalyptus eucharists eugenicist eulogizing euphemisms euphonious eurodollar eurythmics euthanasia evacuation evaluating evanescent evangelism evaporates evenhanded, eventually evergreens everything everywhere evidential eviscerate evolutions exacerbate exactingly exaggerate exaltation exasperate excavation excellence exceptions excerpting exchanging excitation excitement exclaiming exclusions excoriated excrements excretions exculpated excursions excuseless executable executions executives exemptions exercising exfoliated exhalation exhausting exhibiting exhilarate exhumation exigencies existences exobiology exonerates exorbitant exorcizing exospheric exothermic exotically expandable expansions expatiates expectancy expectedly expedience expediting expedition expendable experience experiment expiration explaining expletives explicable explicitly exploiters explosions explosives exportable exposition expository expounding expressing expression expressive expressway expulsions expurgated extendable extensions extenuated externally extinction extinguish extirpated extortions extraction extradites extralegal extraneous extremists extricated extroverts extrusions exuberance exultation eyeballing eyedropper eyeglasses eyewitness