Source : Webster's Revised Unabridged Dictionary (1913)

Microsthene \Mi"cro*sthene\, n. [Micro- + Gr. sqe`nos might,
   strength.] (Zo["o]l.)
   One of a group of mammals having a small size as a typical
   characteristic. It includes the lower orders, as the
   {Insectivora}, {Cheiroptera}, {Rodentia}, and {Edentata}.