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

Officers allegedly found about 525 shell casings and 13 firearms. —Sofia Saric, Miami Herald, 7 Jan. 2026

While defense attorneys argued that the teacher provided the only evidence that the shooter was on the south side of the school, prosecutors said that bullet casings would corroborate their argument. —Peter Charalambous, ABC News, 7 Jan. 2026

Three 9 mm shell casings were found in the home, police said. —Maggie Vespa, NBC news, 7 Jan. 2026

Police recovered one shell casing at the scene, cops said. —Kerry Burke, New York Daily News, 6 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