octodont

from The Century Dictionary.

• Having eight teeth (that is, four grinders above and below on each side); of or pertaining to the genus Octodon or the family Octodontidæ.
• noun A member of the genus Octodon or the family Octodontidæ; an octodon.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Zoöl.) Of or pertaining to the Octodontidæ, a family of rodents which includes the coypu, and many other South American species.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology Any of the Octodontidae, a family of rodents including the coypu and many other South American species.