Rarefaction: nf (word from medieval Latin rarefactio).
The word "rarefaction" has several meanings:
1. Being rare; decrease in the density of a gas and increase in its volume.
Scarcity of air, oxygen in the high mountains.
Pathology: Rarefaction of bone tissue: osteoporosis.
2. Decrease in the quantity of products on the market.
Food scarcity in times of crisis.
Scarcity caused by speculators, by an embargo....
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