noun.
Inability to digest or difficulty in digesting something, especially food.
noun.
Discomfort or illness resulting from this inability or difficulty.
The Century Dictionary and Cyclopedia
noun.
Want of digestion; incapability of or difficulty in digesting food; dyspepsia.
the GNU version of the Collaborative International Dictionary of English
noun.
Discomfort due to a lack of proper digestive action; a failure of the normal changes which food should undergo in the alimentary canal; dyspepsia; incomplete or difficult digestion.