Dictionary:

celiac

  (sē'lē-ăk')

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Of or relating to the abdomen or abdominal cavity.

[Latin coeliacus, from Greek koiliakos, from koiliā, abdomen, from koilos, hollow.]

Of or relating to the abdomen or abdominal cavity.

Pertaining to the abdomen.

• c. disease — a malabsorption syndrome in humans characterized by marked atrophy and loss of function of the villi of the jejunum (and rarely, the cecum). Called also celiac sprue, gluten-induced enteropathy, nontropical sprue, and adult, childhood or infantile celiac disease. Occasionally suspected as the cause of villous atrophy in dogs.

The adjective has 2 meanings:

Meaning #1: belonging to or prescribed for celiac disease
  Pertains to noun: celiac disease (meaning #1)

Meaning #2: of or in or belonging to the cavity of the abdomen
  Synonym: coeliac
  Pertains to noun: abdominal cavity (meaning #1)