Also means
sealed off
Usage Note
Estanco as an adjective means hermetically sealed or compartmentalised — compartimentos estancos are watertight compartments. As a noun (masculine), el estanco is the government-licensed shop in Spain that sells tobacco, stamps, and official documents, a system rooted in the colonial-era monopoly (estanco) on certain goods.
Examples
"Las secciones del barco son compartimentos estancos."
Natural Translation
The ship's sections are watertight compartments.

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