The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
the presence of a single set of functioning teeth during the lifetime of an organism, observed in some mammals (for example, in Chiroptera, some Edentata, and Cetacea).
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.