What is "lank hair"

Lank \Lank\ (l[a^][ng]k), a. [Compar. Lanker; superl. Lankest.] [ AS. hlanc; cf. G. lenken to turn, gelenk joint, OHG. hlanca hip, side, flank, and E. link of a chain.]

1. Slender and thin; not well filled out; not plump; shrunken; lean.

   Meager and lank with fasting grown.
   --Swift.

   Who would not choose . . . to have rather a lank purse than an empty brain?
   --Barrow.

2. Languid; drooping. [Obs.]

   Who, piteous of her woes, reared her lank head.
   --Milton.

   Lank hair, long, thin hair.
   --Macaulay.