sac

1 of 4

noun

ˈsak 

: a pouch within an animal or plant often containing a fluid

a synovial sac

saclike

ˈsak-ˌlīk 

adjective

sac

2 of 4

abbreviation (1)

sacrifice

Sac

3 of 4

variant of sauk

SAC

4 of 4

abbreviation

1

special agent in charge

2

Strategic Air Command

Examples of sac in a Sentence

Recent Examples on the Web

Noun

Cormier says that bees can be dangerous (even dead ones can sting, if stepped on, so long as their stinger and venom sac are still intact). — Richard Schiffman, Christian Science Monitor, 22 July 2026

After several hours, doctors suspected Flower had pericarditis — inflammation of the sac surrounding the heart — and sent her home for the second time that day. — Jordan Greene, PEOPLE, 22 July 2026

In the OptiTROP-Lung05 study conducted in China, sac-TMT plus Keytruda significantly delayed tumor progression compared to chemotherapy plus Keytruda in patients with first-line, PDL1-negative, non-squamous lung cancer. — Elaine Chen, STAT, 15 July 2026

This year’s Venice Classics lineup will debut 19 restorations, including Cul-de-sac (1966), one of Roman Polanski’s British films, restored by Fixafilm. — Zac Ntim, Deadline, 3 July 2026

Word History

Etymology

Noun

French, literally, bag, from Latin saccus — more at sack

First Known Use

Noun

1741, in the meaning defined above

Phrases Containing sac

• air sac
• amniotic sac
• cul-de-sac
• embryo sac
• honey sac
• pollen sac
• sac bunt
• sac fly
• sac fungus
• yolk sac

Rhymes for sac

• ack
• brack
• clack
• crack
• dak
• flack
• flak
• hack
• jack
• knack
• lac
• lack

Kids Definition

sac

noun

ˈsak

: a pouch in an animal or plant often containing a fluid

a food-storage sac

saclike

-ˌlīk

adjective

Medical Definition

sac

noun

ˈsak 

: a soft-walled anatomical cavity usually having a narrow opening or none at all and often containing a special fluid

a synovial sac

see air sac, amniotic sac, dental sac, lacrimal sac