NOUN (1)

1. any substance that promotes digestion;


ADJECTIVE (1)

1. relating to or having the power to cause or promote digestion;
- Example: "digestive juices"
- Example: "a digestive enzyme"
- Example: "digestive ferment"

The Collaborative International Dictionary of English v.0.48:

Digestive \Di*gest"ive\, n.
   1. That which aids digestion, as a food or medicine.
      --Chaucer.
      [1913 Webster]

            That digestive [a cigar] had become to me as
            necessary as the meal itself.         --Blackw. Mag.
      [1913 Webster]

   2. (Med.)
      (a) A substance which, when applied to a wound or ulcer,
          promotes suppuration. --Dunglison.
      (b) A tonic. [R.]
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Digestive \Di*gest"ive\, a. [F. digestif, L. digestivus.]
   Pertaining to digestion; having the power to cause or promote
   digestion; as, the digestive ferments.
   [1913 Webster]

         Digestive cheese and fruit there sure will be. --B.
                                                  Jonson.
   [1913 Webster]

   Digestive apparatus, the organs of food digestion, esp. the
      alimentary canal and glands connected with it.

   Digestive salt, the chloride of potassium.
      [1913 Webster]

WordNet (r) 3.0 (2006):

digestive
    adj 1: relating to or having the power to cause or promote
           digestion; "digestive juices"; "a digestive enzyme";
           "digestive ferment"
    n 1: any substance that promotes digestion