A protective or decorative covering that encloses or surrounds something. It can refer to the outer shell of mechanical devices, the covering around sausages, or the framework around doors and windows.
From the verb 'case,' meaning 'to cover' or 'enclose,' derived from Old French 'cas' meaning 'box' or 'container.' The '-ing' suffix indicates the result of the action, so casing is literally 'the result of encasing something.'
Casing demonstrates how one simple concept - putting something inside something else - appears everywhere in human technology and nature. From phone cases to egg shells to architectural trim, we constantly create protective boundaries, making casing a fundamental principle of design.
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