The Collaborative International Dictionary of English v.0.48:

Carminative \Car*min"ative\, a. [NL. carminativus (1622), fr.
   carminare to card, hence to cleanse, fr. carmen a card for
   freeing wool or flax from the coarser parts, and from
   extraneous matter: cf. F. carminatif.]
   Expelling wind from the body; warming; antispasmodic.
   "Carminative hot seeds." --Dunglison.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Carminative \Car*min"a*tive\, n.
   A substance, esp. an aromatic, which tends to expel wind from
   the alimentary canal, or to relieve colic, griping, or
   flatulence.
   [1913 Webster]

WordNet (r) 3.0 (2006):

carminative
    adj 1: relieving gas in the alimentary tract (colic or
           flatulence or griping) [syn: carminative, flatus-
           relieving]
    n 1: medication that prevents the formation of gas in the
         alimentary tract or eases its passing