also water-tight, late 14c., from water (n.1) + tight (adj.). Figurative use from 1640s.

A watertight enclosure is designed to exclude water applied in the for...

(adj) not allowing water to pass in or out(adj) without flaws or loopholes

Constructed so that moisture will not enter the enclosure under specified test conditions.

        Something that can not be penetrated by, leak water or any other liquids.

Sealed switch will withstand submersion to various depths depending on specification level.

So constructed as to exclude water applied in the form of a hose stream under specified test conditions.

Constructed so that moisture will not enter the enclosure under specified test conditions.

Constructed so that moisture will not enter the enclosure under specified test conditions.

Impervious to water.

Capable of keeping out water.

Capable of preventing the ingress of water under a head of water likely to occur in the intact or damaged condition.

capable of keeping out water.

An enclosure which prevents leakage when water strikes or covers the enclosure. No ventilation or other openings are permitted in the enclosure. Related terms which might be used include the following [..]

So tightly made that water cannot enter or escape. So devised or planned as to be impossible to defeat, evade or nullify. ''a watertight contract; a watertight regulation.''