the enclosing frame around a door or window opening | 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 |
the housing or outer covering of something | the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close |
the outermost covering of a pneumatic tire | the smallest detectable sensation |
| a region marking a boundary |
| the starting point for a new state or experience |