word
cosmic microwave background
KOZ-mik MY-kroh-wayv BAK-grownd
ˈkɒzmɪk ˈmaɪkroʊweɪv ˈbækɡraʊndListen
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Syllable breakdown
cosmicmicrowavebackground
Dictionary meaning
thermal radiation left over from the Big Bang, filling the entire universe; the oldest light in the universe
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