'Doorsill' definitions:

Definition of 'doorsill'

(from WordNet)
noun
The sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway [syn: doorsill, doorstep, threshold]

Definition of 'Doorsill'

From: GCIDE
  • Doorsill \Door"sill`\, n. The sill or threshold of a door. [1913 Webster]