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

To send signals, neurons fill cellular sacs with neurotransmitters; then those sacs fuse with the cell membrane to release the signaling compounds on to the next neuron. —Yasemin Saplakoglu, WIRED, 20 Oct. 2024

Narrow windpipe: Breathing resembles trying to inhale through a straw; this can worsen if internal sacs in the windpipe enlarge. —Daniel R. Depetris, Newsweek, 6 Dec. 2024

These are tiny flexible sacs of pigments that are connected to 15 to 25 radial muscle fibers, resembling the spokes of a wheel attached to the hub. —Grrlscientist, Forbes, 26 Nov. 2024

Branchial cleft cysts are sacs filled with fluid found in the neck and can appear as lumps or swelling under the skin. —Matias Grez, CNN, 17 Oct. 2024

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

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