Word Origin and History for semi-Expand before vowels sem-, word-forming element meaning half, part, partly; partial, imperfect; twice, from Latin semi-half, from PIE *semi-half (cf. Sanskrit sami half, Greek hemi-half, Old English sam-, Gothic sami-half).
Well-known rodents include mice, rats, squirrels, prairie dogs, porcupines, beavers, guinea pigs, hamsters, gerbils and capybaras. Other animals such as rabbits, hares, and pikas, whose incisors also grow continually, were once included with them, but are now considered to be in a separate order, the Lagomorpha.
rodents from latin rodere to gnaw are mammals of the order rodentia which are characterized by a single pair of unremittingly growing incisors in each of the upper and lower jaws about forty percent of all mammal species are rodents they are found in vast numbers on all continents except antarcticaell known rodents include mice rats squirrels prairie dogs porcupines beavers guinea pigs hamsters and capybaras other animals such as rabbits hares and pikas were once included with them but are now considered to be in a separate order lagomorpha