1. tongue and groove - Noun
2. tongue and groove - Adjective
tongue and groove (plural tongue and grooves or tongues and grooves)
A joint, in flooring or panelling, made by fitting a ridge (tongue) along the edge of one board into a corresponding slot (groove) on another.
tongue-and-groove (not comparable)
Employing tongue and groove joints.
tongue-and-groove
ASME B16.5 The flange faces are also made to standardized dimensions and are typically "flat face", "raised face", " tongue and groove ", or " ring joint " styles, although other obscure styles are possible. Source: Internet
The lintels were fitted to one another using another woodworking method, the tongue and groove joint. Source: Internet
The tongue and groove on one side is perpendicular to the tongue and groove on the other. Source: Internet