- Amphibious rodent - Beaver-like aquatic rodent - A North American aquatic fur-bearing rodent (Fiber
zibethicus). It resembles a rat in color and having a long scaly tail,
but the tail is compressed, the bind feet are webbed, and the ears are
concealed in the fur. It has scent glands which secrete a substance
having a strong odor of musk. Called also musquash, musk beaver, and
ondatra. - The musk shrew. - The desman.
- In ancient armor, a visor, or projection like the peak of
a cap, to which a face guard was sometimes attached. This was sometimes
fixed, and sometimes moved freely upon the helmet and could be raised
like the beaver. Called also umber, and umbril.