Definitions for sialolith
sialolith, salivary calculus(noun)
a stone formed in the salivary gland
Technically, a calculus in the salivary ducts causing an obstruction. There are others obstructions of the salivary ducts that may also be referred to as sialoliths, including infectious blockage, stenosis, etc. There are also other substances besides calcium that may be the cause of the obstruction.