The DICT Development Group

  Titmouse \Tit"mouse`\, n.; pl. Titmice. [OE. titemose,
     titmase; tit small, or a small bird + AS. m[=a]se a kind of
     small bird; akin to D. mees a titmouse, G. meise, OHG. meisa,
     Icel. meisingr. The English form has been influenced by the
     unrelated word mouse. Cf. Tit a small bird.] (Zool.)
     Any one of numerous species of small insectivorous singing
     birds belonging to Parus and allied genera; -- called also
     tit, and tomtit.
     [1913 Webster]
  
     Note: The blue titmouse ({Parus coeruleus), the marsh
           titmouse ({Parus palustris), the crested titmouse
           ({Parus cristatus), the great titmouse ({Parus
           major), and the long tailed titmouse ({Aegithalos
           caudatus), are the best-known European species. See
           Chickadee.
           [1913 Webster]

  titmouse
      n 1: small insectivorous birds [syn: titmouse, tit]