What does "linen" mean?

Additional senses

1. 2.Thread or cloth made of flax or (rarely) of hemp; -- used in a general sense to include cambric, shirting, sheeting, towels, tablecloths, etc. "In linen white as milk." Robert of Brunne.
2. 3.Underclothing, esp. the shirt, as being, in former times, chiefly made of linen. Linen draper, a dealer in linen. -- Linen prover, a small microscope for counting the threads in a given space in linen fabrics. -- Linen scroll, Linen pattern (Arch.), an ornament for filling panels, copied from the folds of a piece of stuff symmetrically disposed.