housing (n.1) Look up housing at Dictionary.com
"buildings, lodgings," early 14c., husing, from the root of house (n.).
housing (n.2) Look up housing at Dictionary.com
"ornamental covering," c.1300, houce "covering for the back and flanks of a horse," from Old French houce "mantle, horse-blanket" (Modern French housse), from Medieval Latin hultia "protective covering," from a Germanic source, from Proto-Germanic *hulfti (cognates: Middle Dutch hulfte "pocket for bow and arrow," Middle High German hulft "covering"), from PIE root *kel- (2) "to cover, conceal" (see cell). Sense of "case or enclosure for machine or part" is first recorded 1882.