Etymology
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casing (n.)

1570s, "action of fitting with a case," verbal noun from case (v.). Meaning "a covering, an enclosure" is from 1839.

updated on October 09, 2017

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Definitions of casing from WordNet

casing (n.)
the housing or outer covering of something;
Synonyms: shell / case
casing (n.)
the outermost covering of a pneumatic tire;
casing (n.)
the enclosing frame around a door or window opening;
the casings had rotted away and had to be replaced
Synonyms: case
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.