casing

noun

cas·​ing ˈkā-siŋ 

1

: something that encases : material for encasing: such as

a

: an enclosing frame especially around a door or window opening

b

: a metal pipe used to case a well

c

: tire entry 2 sense 1

d

: a membranous case for processed meat

2

: a space formed between two parallel lines of stitching through at least two layers of cloth into which something (such as a rod or string) may be inserted

Synonyms of casing

• sheath
• housing
• covering
• shell
• case

Examples of casing in a Sentence

a casing for a shotgun shell

the egg of this bird has an unusually hard casing

Recent Examples on the Web

Investigators quickly identified Armstrong, then 35, as a suspect after surveillance footage showed her vehicle near the scene shortly before the shooting and forensic evidence tied a gun registered to her to shell casings at the scene. —Kiah Collier, Austin American Statesman, 23 Jan. 2026

Investigators determined the gun was consistent with having fired the three 9mm shell casings recovered outside the drive-thru window that killed Gray. —Adam Thompson, CBS News, 22 Jan. 2026

Cops recovered a single shell casing at the scene of the shooting. —Thomas Tracy, New York Daily News, 22 Jan. 2026

Plus, the acrylic casing keeps items protected. —Shea Simmons, PEOPLE, 21 Jan. 2026

Word History

First Known Use

1791, in the meaning defined at sense 1

Rhymes for casing

• basing
• bracing
• chasing
• facing
• gracing
• lacing
• pacing
• placing
• racing
• spacing
• tracing
• debasing

Kids Definition

casing

noun

cas·​ing ˈkā-siŋ 

1

: something that encloses or surrounds

2

: a frame around a door or window opening