étanche
watertight, waterproof
adjective ay-TAHNSH Rare
Origin: Old French estanche, from estanchier (to stop a flow)
Also means
airtight (sealed)
Usage Note
Étanche is used for watches, hulls, containers, and seals that keep water (or other fluids) out. The extended sense 'airtight' appears in compartiment étanche and figuratively in cloisonnement étanche (rigid separation of domains). The noun is l'étanchéité (waterproofness).
Examples
"Ma montre est étanche jusqu'à 50 mètres."
Natural Translation
My watch is waterproof to 50 metres.
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