Gravel Gertie (English, noun)
expansion: Gravel Gertie (plural Gravel Gerties)
Senses:
glosses: A chamber, with a roof covered by a deep pile of gravel, within which nuclear warheads may be maintained; in the event of a (non-nuclear) explosion, the roof is weakened and the gravel falls and prevents the escape of nuclear material
Forms:
form: Gravel Gerties
tags: plural