sac
UK[sæk]US[sæk]
n
A pouch or bag-like structure in an animal or plant, often containing fluid or air.
n
A hollow, flexible structure resembling a bag.
Etymology
The word 'sac' entered English in the 18th century as a scientific term, borrowed directly from French to describe a specialized anatomical or biological pouch. Its lineage can be traced back through Latin and Greek to a Semitic origin, reflecting the ancient trade of sackcloth. The core semantic concept of a 'bag' or 'container' has remained remarkably stable for millennia, narrowing in modern English to denote specific natural structures that perform a containing function, such as an amniotic sac or a pollen sac. This journey from a common object of coarse material to a precise term in life sciences illustrates the specialization of vocabulary within technical fields.
Analysis
The word 'sac' is a simplex word. It is a direct borrowing from the French 'sac', meaning 'bag, sack', which itself derives from the Latin 'saccus', meaning 'bag, sack'. The Latin term originates from the Greek 'sakkos', meaning 'bag made of coarse cloth or hair', which was likely borrowed from a Semitic source, such as Phoenician or Hebrew ('śaq').
Examples
The doctor explained that the amniotic sac protects the developing fetus.
Spiders store their eggs in a silken sac.
A fluid-filled sac, or cyst, had formed on her ovary.