| Abbreviations | Meaning |
 | MMIHS | Megacystis-microcolon-intestinal Hypoperistalsis Syndrome |
| IO | Incisal Opening; Inferior Oblique; Inferior Olive; Internal Os; Interorbital; Intestinal Obstruction; Intraocular; Intraoperative; Intra-osseous |
| FBD | Functional Bowel Disorder/distress |
| GE | Gastrointestinal Endoscopy |
| MG | Medial Gastrocnemius [muscle] |
| FIFR | Fasting Intestinal Flow Rate |
| GER | Gas Exchange Region; Gastroesophageal Reflux; Geriatrics; Granular Endoplasmic Reticulum |
| EGD | Esophagogastroduodenoscopy |
| INT | Interference; Intermediate; Intermittent; Intern, Internship; Internal; Interval; Intestinal; Intima; P-iodonitrotetrazolium |
| UGIS | Upper Gastrointestinal Series |
| SBS | Small Bowel Series |
| MNGIE | Myo-, Neuro-, Gastrointestinal Encephalopathy |
| PGC | Progastricin; Primordial Germ Cell |
| IBDQ | Inflammatory Bowel Disease Questionnaire |
| EGC | Early Gastric Cancer; Epithelioid-globoid Cell |
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