housing (n.1) Look up housing at Dictionary.com
"buildings, lodgings," early 14c., husing, from 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 (source also of Middle Dutch hulfte "pocket for bow and arrow," Middle High German hulft "covering"), from PIE root *kel- (1) "to cover, conceal, save." Sense of "case or enclosure for machine or part" is first recorded 1882, verbal noun from house (v.).