I. ˈlüt noun
Etymology: Middle English, from Middle French lut, from Old Occitan laut, from Arabic al-‘ūd, literally, the wood
Date: 13th century
: a stringed instrument having a large pear-shaped body, a vaulted back, a fretted fingerboard, and a head with tuning pegs which is often angled backward from the neck
II. transitive verb
( lut·ed ; lut·ing )
Etymology: Middle English, from Latin lutare, from lutum mud — more at pollute
Date: 14th century
: to seal or cover (as a joint or surface) with lute
III. noun
Date: 15th century
: a substance (as cement or clay) for packing a joint or coating a porous surface to make it impervious to gas or liquid