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

This revealed that the creature had short arms, few arm suckers, and no ink sac, as well as having very smooth skin and a large rachidian tooth. —ArsTechnica, 1 June 2026

The shots induce the ovaries to ripen multiple follicles, the sacs that contain eggs, so that a surgeon can go in with a tiny needle, and drain the fluid in those follicles, which is then run into an adjacent embryology lab to search for the eggs. —Lesley Stahl, CBS News, 31 May 2026

The proud parents decided to test the fluid around baby three’s sac to gain more information about the situation. —Kayla Grant, PEOPLE, 29 May 2026

The sacs were eggs whose development had been arrested, as a result of the broader endocrine disruption. —Veronique Greenwood, Time, 12 May 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