Definitions

1. noun

A hypothetical type of mammal considered to be intermediate between monotremes and therian mammals.

“Scientists have been studying the myomorph fossil to gain a better understanding of mammalian evolution.”

2. noun

A type of insectivorous mammal thought to be an intermediate form between the early mammals and the modern types, especially during the Cretaceous period.

“The discovery of a myomorph fossil provided new insights into the history of mammalian development.”