Small stony concretion that forms within a duct draining a salivary gland, potentially resulting in blockage of the duct. Found on http://www.thehorse.com/Glossary.xhtml?L=S
sialolith A calcareous concretion or calculus in the salivary ducts or glands, involving most commonly the submaxillary gland and its duct, less frequently the parotid and sublingual glands and their ducts, and seldom the minor salivary glands. Also called: salivary calculus and salivary stone. Found on http://www.wordinfo.info/words/index/info/view_unit/1954/4