From Longman Dictionary of Contemporary Englishcasingcas‧ing /ˈkeɪsɪŋ/ noun [countable] Tan outer layer of metal, rubber etc that covers and protects something such as a wire
Examples from the Corpus
casing• But the bomb casings and high explosive charges in nuclear weapons can not withstand fire and explosive shock.• The electrical components should be double insulated for maximum safety and the outer casing made from an ultra violet stabilised material.• Little boys dove in to grab the brass shell casings.• The spent casings were hitting the back of me, and the concussion was pushing my head down.• His armour has become a bandage as stiff as the casing of a chrysalis.• The height of the casing limits the L range to three horizontal full-length 16-bit slots, the same as its predecessor.• Machine a wide casing along the top of each length and thread on to wire or a pole.• The turbine is sealed off behind a tasteful stained wood casing with leaded windows lit from behind. 