n.1903, from tonsillo-, comb. form of tonsil + -lith "stone." if (window.googletag) {googletag.cmd.push(function() { googletag.display('dcomMobileSERPDisplayTopAd-300x250'); });} else {console.error('googletag not defined, dcomMobileSERPDisplayTopAd-300x250');} n.A calcareous concretion in a tonsil.