dalk

noun2

1. •
   A pin; brooch; clasp.
2. •
   (no longer used) A hollow or depression.

   • On a sunny September morning, with the trees still green, but the asters and fleabanes already taking over in ditch and dalk, Van set out for Ladoga, N.A. — 1969

noun1

1. •
   Initialism of deep anterior lamellar keratoplasty.