NOUN (1)

1. someone who has diabetes;


ADJECTIVE (2)

1. of or relating to or causing diabetes;

2. suffering from diabetes;

The Collaborative International Dictionary of English v.0.48:

Diabetic \Di`a*bet"ic\, Diabetical \Di`a*bet"ic*al\, a.
   Pertaining to diabetes; as, diabetic or diabetical treatment.
   --Quian.
   [1913 Webster]

   Diabetic sugar. (Chem.) Same as Dextrose. Diablerie

WordNet (r) 3.0 (2006):

diabetic
    adj 1: of or relating to or causing diabetes
    2: suffering from diabetes
    n 1: someone who has diabetes

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "diabetic":
   allergic, anemic, apoplectic, arthritic, bilious, cancerous,
   chlorotic, colicky, consumptive, dropsical, dyspeptic, edematous,
   encephalitic, epileptic, laryngitic, leprous, luetic, malarial,
   malignant, measly, nephritic, neuralgic, neuritic, palsied,
   paralytic, phthisic, pleuritic, pneumonic, pocky, podagric,
   rachitic, rheumatic, rickety, scorbutic, scrofulous, tabetic,
   tabid, tubercular, tuberculous, tumorigenic, tumorous