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.
Confidence votes 77.7K. Bats are not winged rodents or any other kind of rodent. The bats are of the mamalian order Chiroptera, while rodents are of the mamalian order Rodentia. A link is provided to the Wikipedia article on scientific classification. If the curious person surfed on over there, he could use the article, and particularly the links from it to other articles.