Italian · Pronunciation Guide
CHEH-lo, just two syllables. In IPA: /ˈtʃɛlo/.
Written as two syllables, cie and lo, but the i in "cie" is silent, so what you actually say is closer to one clean syllable, "che," followed by "lo."
Listen: il cielo (m.)
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Unlike "ciao," where the i is required to keep the c soft before a, o, or u, the i in "cielo" isn't doing any grammatical work: c is already soft before e on its own, as in "cena" or "centro," so this i is a historical spelling leftover that Italians never actually pronounce.
Il cielo è azzurro oggi.
The sky is bright blue today.
Listen: Il cielo è azzurro oggi.
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"Il cielo" is the sky, and the example, "Il cielo è azzurro oggi" ("The sky is bright blue today"), uses "azzurro," a color word with no single-word English equivalent, it specifically means a bright, clear sky blue, distinct from the more general "blu." Italian carves up the blue part of the color spectrum more finely than English does in everyday speech, and "azzurro" is the default word for describing a clear sky.
"È" here is simply the third-person singular of "essere" (to be), used exactly as English "is" would be in this straightforward description.
The silent i is the main trap: English readers expect every vowel letter to register as a sound, so "cielo" often gets stretched into three beats, chee-EH-lo, treating the i as a full syllable of its own. It isn't, it's a purely orthographic leftover, and the word stays at two syllables, CHEH-lo.
There's also a temptation to reach for an "s" or "see" sound on the ci, by loose analogy with English words like "cinema" that also start ci-. Italian ci before a vowel is always a hard "ch," as in "chip" or "cheese," never an "s" and never the "see" syllable English spelling might suggest.