Layer, mattress - one thickness of typically some homogeneous material; "slices of tricky-boiled egg on a mattress of spinach" doorway, home entry, doorway, threshold - the doorway (the Place in the wall) through which you enter or leave a space or developing; the Room that a doorway can close; "he https://archertybfj.wikilowdown.com/6064372/a_review_of_wall