Spanish · Pronunciation Guide
dyess, one syllable — the ie glides together and the z is a plain s sound.
With one syllable there is no placement decision to make. The word is a good reference point for its relatives: "dieciséis" needs a written accent to hold the stress at the end, while "diez" itself needs nothing at all because a single syllable cannot be mis-stressed.
Listen: diez
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Son las diez y media.
It's half past ten.
Listen: Son las diez y media.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"Son las diez y media" uses "y" for and, pronounced simply "ee", and it links onto the word before it so "diez y" comes out DYEH-see. "Media" repeats the same ie glide as "diez" and stresses ME-dia, the second-to-last syllable, exactly per the default rule.
The z is where English readers go wrong: they buzz it, giving "deez", when Latin American Spanish makes every z a plain s. And the ie gets stretched to two syllables — "dee-EZ" — where the word should be a single compact beat, dyess. Say "yes" with a d in front of it and you are almost there.