معنی کلمه :‌ rodentia

Belonging to, or in accordance with, the principles of rationalism. -- Ra`tion*al*is"tic*al*ly, adv.

An order of mammals having two (rarely four) large incisor teeth in each jaw, distant from the molar teeth. The rats, squirrels, rabbits, marmots, and beavers belong to this order.