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-rias

Source : Webster's Revised Unabridged Dictionary (1913)

Planaria \Pla*na"ri*a\, n.; pl. L. {Planari[ae]}, E. {-rias}.
   [NL. See {Planary}.] (Zo["o]l.)
   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.