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sac
This term carries a clinical, biological tone. It describes a closed, flexible container that is integrated into a living organism, evoking an image of a membrane-bound pocket rather than a rigid vessel.
In medical or zoological contexts, it is used to describe specific anatomical features like the air sacs in birds or the amniotic sac in mammals. It is rarely used in casual conversation unless referring to specific biological phenomena.
Countable when referring to individual biological pouches, such as a venom sac or a seed sac.
Meanings
Examples
The air sac in a bird allows for efficient respiration during flight.
A small fluid filled sac formed under the skin.
The plant stores nutrients in a specialized seed sac.
Look at how the frog inflates its vocal sac to call for a mate.
The surgeon carefully removed the cyst which was essentially a small sac of tissue.
Some insects carry their eggs in a protective sac until they hatch.
Is this growth just a simple mucus sac?
The venom is stored in a glandular sac near the head.
The embryo develops within the amniotic sac.