We found one dictionary that defines the word invariable pendulums:

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1. invariable pendulums: Wiktionary

▸ Words similar to invariable pendulums ▸ Usage examples for invariable pendulums ▸ Idioms related to invariable pendulums ▸ Wikipedia articles (New!) ▸ Words that often appear near invariable pendulums ▸ Rhymes of invariable pendulums ▸ Invented words related to invariable pendulums