ˈs(h)tīnˌkern noun
( -s )
Etymology: German, from stein stone + kern kernel, grain, from Old High German kerno; akin to Old High German korn grain — more at corn
: a fossil consisting of a stony mass that entered a hollow natural object (as a bivalve shell) in the form of mud or sediment, was consolidated, and remained as a cast after dissolution of the mold