Casings

Part of speech: noun

Pronunciation: /ˈkeɪsɪŋz/

Definitions

1. A covering or shell surrounding or enclosing something else, especially for protection or support ; a metal container that holds the gunpowder and bullet components of a cartridge for a firearm
2. An external layer that encloses an object, often for protection or insulation ; the tubular metal part that encases the explosive charge and projectile in a bullet
3. A protective or enclosing layer around objects or structures ; the cylindrical metal housing used in ammunition that contains the primer, powder, and projectile

Etymology: "Casings" is the plural of "casing," so its history is really the history of that noun. A casing is the outer covering that encloses something, and the word is built from "case" with the suffix "-ing," which in English turns a noun or verb into a term for a material or covering, as in "lining" or "siding." The base "case" is the older, richer part of the story, since it traces back to a container for holding things, such as a box or sheath. Because "casing" is simply "case" plus a familiar suffix, its meaning stays close to the physical sense of a covering that holds something inside. The plural form, "casings," is used for several such layers at once, as in the many casings around a device or the protective outer layers of a larger structure.

Synonyms: shells, covers, jackets, envelopes, sleeves