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

Ascomycetes don’t always sprout traditional mushrooms, but release their spores from tiny, sac-like structures inside or on the surface of such fruiting bodies instead. — Laura Baisas, Popular Science, 14 Oct. 2026

In a process known as autotomy, the assailing bee leaves its stinger operating independently, driven by its own muscles, various glands, neural ganglia, and a venom sac. — Mike McRae 12, New Atlas, 13 Oct. 2026

There was the time, for example, when dozens of self-driving cars, devoid of passengers, circled a northwest-Atlanta cul de sac for hours. — Molly Fischer, New Yorker, 12 Oct. 2026

My friend, however, is harvesting black widow spider eggs and putting the egg sacs in her freezer. — Literary Hub, 2 Oct. 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