Main Entry: ¹caulk

Variant(s): or calk \ˈkȯk\

Function: transitive verb

Etymology: Middle English caulken, from Anglo-French cauker, calcher, chalcher to trample, from Latin calcare, from calc-, calx heel

Date: 15th century

: to stop up and make tight against leakage (as a boat or its seams, the cracks in a window frame, or the joints of a pipe)

— caulk·er noun