adj.
Pronunciation: ˌ wo ̇ -t ə r- ' t ī t, ˌ wä-
Function: adjective
Date: 14th century
1 : of such tight construction or fit as to be impermeable to water except when under sufficient pressure to produce structural discontinuity
2 : leaving no possibility of misconstruction or evasion <a watertight lease>
– wa · ter · tight · ness noun