D defs.my
Entry 1 sense Webster, 1913

Planarian

/plən-ĕr'-ē-ən/ · Pla·na·ri·an · IPA /pləˈnɛ.ɹi.ən/
01 n. One of the Planarida, or Dendrocœla; any turbellarian worm.
  1. 1.
    One of the Planarida, or Dendrocœla; any turbellarian worm.(Zool.)