What does "housing" mean?

Additional senses

1. 2.(Arch.) (a) The space taken out of one solid, to admit the insertion of part of another, as the end of one timber in the side of another. (b) A niche for a statue.
2. 3.(Mach.) A frame or support for holding something in place, as journal boxes, etc.
3. 4.(Naut.) (a) That portion of a mast or bowsprit which is beneath the deck or within the vessel. (b) A covering or protection, as an awning over the deck of a ship when laid up. (c) A houseline. See Houseline.
4. 5.A cover or cloth for a horse's saddle, as an ornamental or military appendage; a saddlecloth; a horse cloth; in plural, trappings.
5. 6.An appendage to the hames or collar of a harness.