wa·ter·tight

[waw-ter-tahyt, wot-er-]
adjective
1.
constructed or fitted so tightly as to be impervious to water: The ship had six watertight compartments.
2.
so devised or planned as to be impossible to defeat, evade, or nullify: a watertight contract; a watertight alibi.

Origin:
1350–1400; Middle English; see water, tight

wa·ter·tight·ness, noun
non·wa·ter·tight, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
watertight (ˈwɔːtəˌtaɪt) [Click for IPA pronunciation guide]
 
adj
1.  not permitting the passage of water either in or out: a watertight boat
2.  without loopholes: a watertight argument
3.  kept separate from other subjects or influences: different disciplines are often thought of in watertight compartments
 
'watertightness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Watertight is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
Example sentences
The contracts may be watertight, but you can get soaked waiting for a judgment.
The vault shall contact the annular seal in a manner to form a watertight and
  structurally sound connection.
Unlike any other known protein formation, the structures resemble watertight
  zippers running perpendicular to the fibril itself.
Use watertight pipes with clean internal and external surfaces.
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