'encase' originates from Middle English, specifically the word 'encasen,' where 'en-' meant 'in' and 'case' referred to a container or covering.

'encasen' transformed into the modern English word 'encase' through the influence of Old French 'encaser.'

Initially, it meant 'to put in a case or box,' but over time it evolved into its current meaning of 'to cover or surround completely.'