Planaria

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Planaria \Pla*na"ri*a\, n.; pl. L. {Planari[ae]}, E. {-rias}.
     [NL. See {Planary}.] (Zool.)
     Any species of turbellarian worms belonging to {Planaria},
     and many allied genera. The body is usually flat, thin, and
     smooth. Some species, in warm countries, are terrestrial.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  planaria
       n : free-swimming mostly freshwater flatworms; popular in
           laboratory studies for the ability to regenerate lost
           parts [syn: {planarian}]