Definitions for "Tongue and groove joint"
Keywords:  groove, snugly, dado, rabbet, joint
A joint formed by the insertion of the "tongue" of one wood member into the "groove" of the other; modifications include tongue and groove rabbet joint, dado tongue and rabbet, tongued shoulder joint, dado and rabbet joint, dado and lip joint.
A joint in which one part has a groove which receives a projection (tongue) on the other part, shaped to fit snugly.
a mortise joint made by fitting a projection on the edge of one board into a matching groove on another board