Source : Webster's Revised Unabridged Dictionary (1913)

Shrewmouse \Shrew"mouse`\, n. (Zo["o]l.)
   A shrew; especially, the erd shrew.

Source : WordNet®

shrewmouse
     n : small mouselike mammal with a long snout; related to moles
         [syn: {shrew}]
     [also: {shrewmice} (pl)]