wa·ter·tight 
(wôtər-tīt′, wŏtər-)
(wôtər-tīt′, wŏtər-)adj.
1. So tightly made that water cannot enter or escape.
2. Having no flaws or loopholes; impossible to fault, refute, or evade: a watertight alibi; a watertight contract.
- Americanization
- Americanize
- Americanness
- American oyster
- American pit bull terrier
- American plan
- American Revolution
- American saddlebred
- American Samoa
- American shorthair
- American Sign Language
- American Spanish
- American Staffordshire terrier
- American Standard Version
- Americas
- americium
- Americus Vespucius.
- Amerigo
- Amerind
- Amerindian
- Amerindic
- Amersfoort
- Ames
- Ameslan
- Ames test