kuṭaja : [m.] a kind of medicinal herb.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Kuṭaja a kind of root (Wrightia antidysenterica or Neri- cum antidysentericum), used as a medicine Vin i.201 (cp. Vin. Texts ii.45).

Pali-English Dictionary, TW Rhys Davids, William Stede,