A doorframe is the frame that surrounds a door, holding it in place and providing support. It is usually made of wood or metal and helps to keep the door secure and properly aligned. Full definition
The entire interior was painted white except for picking out the inner window frames and sections of doorframes in black to create a backdrop for the owner's collection of art, like this Mogens Lohmann piece in the living room. (idealhome.co.uk)
Since non-smart doorbells are typically very small, builders often route the necessary electrical wiring to doorframes as a default. (cnet.com)
Hardware - mounted gates attach to surrounding walls or doorframes with screws. (babycenter.com)