Wiktionary says that 教, read as きょお means "to teach". However, I have read
that in dictionaries, al forms end in "-う" and not in "-お". Why is 教
different?

EDIT: Yes, it says that in English wiktionary. First, the reading they give is
"kyoo". Second, they define it as "1.to teach; teachings"
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verbs godan-verbs
Why doesn't 教 end in"-う"?
This is a serious misunderstanding, I'm afraid. きょう is just one of the several
readings ([読]{よ}み[方]{かた}) of 教. It's a so-called 'sound-reading' [音読み]{おんよみ},
which are Japanese renderings of Chinese speech. You actually misquoted this
particular reading; it's きょ **う** not きょ **お** , although that would be
pronounced the same way. But as far as Japanese verbs go, that's irrelevant;
you have to look for the 'explanatory reading' [訓読み]{くんよみ}, which gives you a
Japanese word that has (more or less) the same meaning as the original Chinese
word. Wiktionary has the following to say:

### Readings

```

    Goon: きょう (kyō) < けう (keu)
    Kan’on: こう (kō) < かう (kau) (non-Jōyō reading)
    Kun: おしえる (教える, oshieru), おしえ (教え, oshie), おそわる (教わる, osowaru)
    
```

As you can see, all of the multiple kun readings do end in -u. Only these
forms may be conjugated.
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All the Kun endings do end in "u". I believe it is only necessary that the Kun
end in U 教 common Kun おし.えるoshi.eru おそ.わるoso.waru teach; faith; doctrine
Radical: 攵 (rap). Strokes: 11画. Elements: 子⺹攵. Pinyin: jiào / jiāo. Hangul: 교
[gyo]. Nanori: のり / ひさ. Jōyō Kanji 2nd Grade. JLPT N4. Example compounds: キョウ
教条主義【きょうじょうしゅぎ】dogmatism 聖教【せいきょう】sacred teachings; Confucianism; Christianity
教化【きょうか】culture; education; civilization; civilisation おしえる 教える【おしえる】to teach;
to inform; to instruct 英語を教える【えいごをおしえる】to teach English おそわる 教わる【おそわる】to be
taught ▸ Codes and indices ▸ Find words containing 教 / beginning with 教 /
ending with 教 / 教_ / _教
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