watertight

[ waw-ter-tahyt, wot-er- ]

/ ˈwɔ tərˌtaɪt, ˈwɒt ər- /

constructed or fitted so tightly as to be impervious to water: The ship had six watertight compartments.

so devised or planned as to be impossible to defeat, evade, or nullify: a watertight contract; a watertight alibi.

Origin of watertight

Middle English word dating back to 1350–1400; see origin at water, tight

wa·ter·tight·ness, noun non·wa·ter·tight, adjective

In his opinion the House could no longer keep itself in a compartment apart—especially as it was not a watertight compartment.

Punch, or the London Charivari, Vol. 152, March 7, 1917. |Various
In this locomotive the gear is the same as that of the next illustration, but it is securely boxed in a watertight iron cover.

Scientific American Supplement, No. 1157, March 5, 1898 |Various
All drain pipes should be proved to be watertight by plugging up the lower end of the drain pipe and filling it with water.

Scientific American Supplement, No. 421, January 26, 1884 |Various
The roofing paper brought down over this board, and tacked to the under side or edge, makes a watertight joint.

Carpentry and Woodwork |Edwin W. Foster

It was perfectly dry, as the cases were watertight; so we made a big haul of most useful supplies.

A Soldier's Sketches Under Fire |Harold Harvey

watertight

/ (ˈwɔːtəˌtaɪt) /

not permitting the passage of water either in or out a watertight boat

without loopholes a watertight argument

kept separate from other subjects or influences different disciplines are often thought of in watertight compartments

watertightness, noun