housing (n.1)

"buildings, lodgings," early 14c., husing, from house (n.).

housing (n.2)

"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.).

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Definitions of housing from WordNet

housing (n.)
structures collectively in which people are housed;
Synonyms: lodging / living accommodations
housing (n.)
a protective cover designed to contain or support a mechanical component;
housing (n.)
stable gear consisting of a decorated covering for a horse, especially (formerly) for a warhorse;
Synonyms: caparison / trapping