As a noun casing is
that which encloses or encases.
As a verb casing is
Not English Wikidiffcom has no English definition. It may be misspelled.
That which encloses or encases.
(uncountable, computing) The collective states of upper and lower case letters.
- Some people like to split the casing of a sausage before cooking so it doesn't burst. Others don't.
- The replacement string should have the same casing as the matched text.
* sausage casing