kell

noun4

1. •
   (no longer used) The caul (membrane)
2. •
   (figurative, no longer used) That which covers or envelops, like a caul; a net; a fold; a film.

   • I'll have him cut to the kell. — 1608
3. •
   (no longer used) The cocoon or chrysalis of an insect.
4. •
   (no longer used) A kiln.