"The"
The Greek word that means "the" is,
ὁ
It is pronounced, "ho."
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What do you think the squiggly line over the omicron is? It looks like a smooth breathing but it is opening to the right, not left.
Did you guess this is a rough breathing? Very good. Just like the smooth breathing, it is over the first vowel in a word. But unlike the smooth breathing, the rough breathing adds a "h" sound before the vowel. This is why ὁ is pronounced "ho" and not "o."
The rough breathing is transliterated as an "h" and placed before the vowel. ὁ is transliterated as ho.