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

The females will lay 200 or more eggs, protected by cottony eggs sacs, which then hatch in a few days into crawlers that creep away to find new places to feed, says Del-Pozo. —Arricca Elin Sansone, Southern Living, 31 July 2025

Jenner, who resides in Austin, Texas, discovered that there were five sacs and potentially a sixth. —Alyce Collins, MSNBC Newsweek, 13 July 2025

An exosome is a teeny sac inside a cell, or what a scientist might call an extracellular vesicle. —Boutayna Chokrane, Wired News, 30 May 2025

Non-identical twins come from two different eggs and will have two sacs and two placentas; identical twins come from the same egg, but most develop separate placentas and amniotic sacs for each baby. —Nicole Villalpando, Austin American Statesman, 2 July 2025

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