We found one dictionary that defines the word pp-wave spacetime:

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1. Pp-wave spacetime: Wikipedia, the Free Encyclopedia

▸ Words similar to pp-wave spacetime ▸ Usage examples for pp-wave spacetime ▸ Idioms related to pp-wave spacetime ▸ Wikipedia articles (New!) ▸ Words that often appear near pp-wave spacetime ▸ Rhymes of pp-wave spacetime ▸ Invented words related to pp-wave spacetime