French · Pronunciation Guide
luh-y — one syllable, with the rounded /œ/ vowel and a "y" glide. And the plural is completely different: "les yeux".
One syllable, article included. The plural is suppletive — "les yeux", /le.z‿jø/ — which shares no sounds with the singular except the glide. This is one of the most irregular nouns in the language.
Listen: l'œil (m.)
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J'ai quelque chose dans l'œil.
I've got something in my eye.
Listen: J'ai quelque chose dans l'œil.
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"J'ai quelque chose dans l'œil" uses "dans" for something being in your eye. "Quelque chose" compresses to roughly "kelk-SHOHZ" in speech. The elision in "l'œil" is required — you can never say "le œil". Note that the plural would change everything: "dans les yeux".
The ending gets a real "l", producing "loyl" or "leel". It is a "y" glide, so the word finishes on a vowel-like sound. The ligature also startles people, but it is just the /œ/ vowel. And the plural catches everyone out — "les œils" does not exist; it is "les yeux", with an obligatory "z" liaison from "les".