Definition of sac in English:



  • 1A hollow, flexible structure resembling a bag or pouch.

    ‘a fountain pen with an ink sac’
    • ‘Reseal the plastic sac and leave it rocking for 1 h at room temperature.’
    • ‘The production of the plastic sac requires the use of the special production facilities, whereas the filling of the plastic sac with a specific kind of gas also calls for the use of the special equipment.’
    • ‘Rain Reviva is a system of flexible plastic sacs for storing rainwater - or recycling waste water - under the house.’
    • ‘As the air filled the sac, the balloon took on an impossibly long shape.’
    bag, pouch, bladder, blister
    bursa, acinus, follicle, cyst, saccule, utricle, vesicle, vesica, vesicula, theca, liposome
    View synonyms
    1. 1.1A cavity within an organism, enclosed by a membrane and containing air, liquid, or solid structures.
      • ‘For example, the tiny air sacs in lungs expand more than seven times when you inhale.’
      • ‘The female was fed one cricket per day until an egg sac was produced.’
      • ‘The amniotic sac that contains your baby begins to form about 12 days after conception.’
      • ‘At 8:30 AM, the obstetrician manually broke the patient's amniotic fluid sac in an effort to speed up labor.’
      • ‘If chemicals are splashed into the eye, the eye and the conjunctival sacs should be washed out immediately with copious amounts of water.’
      • ‘Fistulas commonly extend from the rectal sac to the perineum or genital tract in a female, or to the urinary tract in a male.’
      • ‘In the field of biology, biochemists have been studying vesicles, the small membrane sacs found within cells.’
      • ‘Worst bit: having to take out the squid's ink sac.’
      • ‘This is particularly noticeable in the knee and hip where we have big fluid sacs.’
      • ‘Tests have also shown that if a needle is placed into the sac and touches the baby, the baby feels pain and will immediately move away.’
      • ‘And I think the blisters resemble pomelo pulp sacs.’
      • ‘In human beings, the testis is located outside the body in the scrotal sac.’
      • ‘Sepia comes from the Greek word for the rich reddish-brown pigment obtained from a fluid that is secreted by the cuttlefish from their ink sac.’
      • ‘The yolk sac was completely absorbed, but the site of attachment was still visible.’
      • ‘‘Surfactant keeps the tiny air sacs in the lungs open,’ Hein says.’
      • ‘Each anther cone was gently agitated to release the pollen sacs into the dye solution.’
      • ‘The ink sac can make cleaning the squid a bit messy, but all it needs is a good rinse and it's gone.’
      • ‘These protein and lipid molecules are then transported inside lysosomes -- minute, balloon-like sacs within the cell.’
      • ‘Scientists also suspect that air pollutants might dampen the growth of alveoli, tiny air sacs in the lungs.’
      • ‘Fish make the popping noises by sending air through different chambers of their swim bladders, the inflatable sacs that help fish float.’
    2. 1.2The distended membrane surrounding a hernia, cyst, or tumour.
      • ‘On physical examination, a swollen, fluid-filled sac is noted and palpated over the olecranon.’
      • ‘Essentially, an ovarian cyst is nothing more than a fluid-filled sac, like a blister, on an ovary.’
      • ‘This procedure meant cutting directly into the back of the knee, tying the damaged artery above and below the aneurysm and scraping out the blood-filled sac.’
      • ‘Prior to this Claudius Amyand, physician to Queen Anne, in 1736 successfully removed an acutely inflamed appendix from inside the hernial sac of a young boy.’
      • ‘A visit to the local hospital did not improve matters as the doctor inadvertently punctured a small sac in his elbow which required extensive treatment back in Melbourne.’
      • ‘Alternatively, they can be drained with a needle and syringe, although the sac of the hydrocele may fill with fluid again after a few months.’
      • ‘In the vicinity of this mass, there was a hernia sac.’
      • ‘A cyst is a fluid-filled sac that can grow in any part of the body.’
      • ‘In the distal folds of the hernia sac, a small erosion was noted.’
      • ‘They are swollen, fluid-filled sacs which often become enlarged and painful.’
      • ‘If there is a recurrence (which unfortunately does often happen) then operative removal of the cyst and its sac becomes necessary.’
      • ‘If the leak persists or the aneurysmal sac enlarges, intervention becomes necessary.’
      • ‘As people get older, fluid-filled sacs, called ‘cysts,’ can form in the kidneys.’
      • ‘A breast cyst is a fluid-filled sac, like a tiny balloon, inside the breast.’
      • ‘PCOS is a hormone problem that can cause the ovaries to become enlarged and develop fluid-filled sacs.’


Mid 18th century (as a term in biology): from French sac or Latin saccus sack, bag.




Definition of SAC in English:


  • Senior Aircraftman or Senior Aircraftwoman.