The Collaborative International Dictionary of English v.0.48:

Shrew \Shrew\, n. [See Shrew, a.]
   1. Originally, a brawling, turbulent, vexatious person of
      either sex, but now restricted in use to females; a
      brawler; a scold.
      [1913 Webster]

            A man . . . grudgeth that shrews [i. e., bad men]
            have prosperity, or else that good men have
            adversity.                            --Chaucer.
      [1913 Webster]

            A man had got a shrew to his wife, and there could
            be no quiet in the house for her.     --L'Estrange.
      [1913 Webster]

   2. [AS. scre['a]wa; -- so called because supposed to be
      venomous. ] (Zool.) Any small insectivore of the genus
      Sorex and several allied genera of the family
      Sorecidae. In form and color they resemble mice, but
      they have a longer and more pointed nose. Some of them are
      the smallest of all mammals.
      [1913 Webster]

   Note: The common European species are the house shrew
         (Crocidura araneus), and the erd shrew (Sorex
         vulgaris) (see under Erd.). In the United States
         several species of Sorex and Blarina are common, as
         the broadnosed shrew (Sorex platyrhinus), Cooper's
         shrew (Sorex Cooperi), and the short-tailed, or mole,
         shrew (Blarina brevicauda). Th American water, or
         marsh, shrew (Neosorex palustris), with fringed feet,
         is less common. The common European water shrews are
         Crossopus fodiens, and the oared shrew (see under
         Oared).
         [1913 Webster]

   Earth shrew, any shrewlike burrowing animal of the family
      Centetidae, as the tendrac.

   Elephant shrew, Jumping shrew, Mole shrew. See under
      Elephant, Jumping, etc.

   Musk shrew. See Desman.

   River shrew, an aquatic West African insectivore
      (Potamogale velox) resembling a weasel in form and size,
      but having a large flattened and crested tail adapted for
      rapid swimming. It feeds on fishes.

   Shrew mole, a common large North American mole (Scalops
      aquaticus). Its fine, soft fur is gray with iridescent
      purple tints.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Potamogale velox
    n 1: amphibious African insectivorous mammal that resembles an
         otter [syn: otter shrew, potamogale, Potamogale
         velox]