We found one dictionary that defines the word nonperiodic comet:

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1. nonperiodic comet: Wiktionary

Opposite: periodic comet, short-period comet ▸ Words similar to nonperiodic comet ▸ Usage examples for nonperiodic comet ▸ Idioms related to nonperiodic comet ▸ Wikipedia articles (New!) ▸ Words that often appear near nonperiodic comet ▸ Rhymes of nonperiodic comet ▸ Invented words related to nonperiodic comet