Source : Webster's Revised Unabridged Dictionary (1913)

Papain \Pa*pa"in\, n. [From {Papaw}.] (Physiol. Chem.)
   A proteolytic ferment, like trypsin, present in the juice of
   the green fruit of the papaw ({Carica Papaya}) of tropical
   America.

Papaw \Pa*paw"\, n. [Prob. from the native name in the West
   Indies; cf. Sp. papayo papaw, papaya the fruit of the papaw.]
   [Written also {pawpaw}.]
   1. (Bot.) A tree ({Carica Papaya}) of tropical America,
      belonging to the order {Passiflore[ae]}. It has a soft,
      spongy stem, eighteen or twenty feet high, crowned with a
      tuft of large, long-stalked, palmately lobed leaves. The
      milky juice of the plant is said to have the property of
      making meat tender. Also, its dull orange-colored,
      melon-shaped fruit, which is eaten both raw and cooked or
      pickled.

Source : WordNet®

Carica papaya
     n : tropical American shrub or small tree having huge deeply
         palmately cleft leaves and large oblong yellow fruit
         [syn: {papaya}, {papaia}, {pawpaw}, {papaya tree}, {melon
         tree}]