Rodentia is an order of mammals also known as rodents, characterized by two continuously-growing incisors in the upper and lower jaws which must be kept short by gnawing. Common rodents include mice, rats, squirrels, chipmunks, gophers, porcupines, beavers, hamsters, gerbils, guinea pigs, chinchillas.odentia is an order of mammals also known as rodents, characterized by two continuously-growing incisors in the upper and lower jaws which must be kept short by gnawing. Common rodents include mice, rats, squirrels, chipmunks, gophers, porcupines, beavers, hamsters, gerbils, guinea pigs, chinchillas.
GEST n (in Britain) acronym for Grants for Education, Support and Training: money allocated to Local Education Authorities by the central government
GIST is an abbreviation for GastroIntestinal Stromal Tumour. 1  Gastrointestinal means that it occurs in the digestive tract, anywhere from the oesophagus to the rectum i.e. the gullet, stomach, intestines. So, for example, a GIST in or near the colon is not cancer of the colon because it does not occur in the functioning part of the colon but in the tissues which support the colon.