How many letters does the top answer for “so tightly fitted as to preclude the escape of gas; impervious to gas.” have?

The most common answer is gastight (8 letters).

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Crossword clue: so tightly fitted as to preclude the escape of gas; impervious to gas.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

gastight 8 letters web-def

So tightly fitted as to preclude the escape of gas; impervious to gas.

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)