noun Pathology.
dryness of the mouth caused by diminished function of the salivary glands due to aging, disease, drug reaction, etc.

1885–90; xero- + Neo-Latin -stomia a condition of the mouth, as specified by the 1st element; see -stome, -ia

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World English Dictionary
xerostomia (ˌziːrəˈstəʊmɪə)
abnormal lack of saliva; dryness of the mouth
[C19: from xero- + -stom(e) + -ia]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

xerostomia xe·ro·sto·mi·a (zēr'ə-stō'mē-ə)
Dryness of the mouth resulting from diminished or arrested salivary secretion.

The American Heritage® Stedman's Medical Dictionary
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