A Quick and Simple Dictionary

OH

1. (abbreviation) .  (US) Ohio, a state of the United States of America.
2. (abbreviation) .  (organic chemistry) Symbol for a hydroxyl, or alcohol, functional group.
3. (abbreviation) .  (inorganic chemistry) Symbol for a hydroxide radical, or hydroxyl group.
4. (abbreviation) .  (US, army) Prefix code for observation helicopter designations.
5. (abbreviation) .  (Internet slang) Other Half, i.e. Husband, wife, partner etc.
6. Interjection.  Expression of surprise.
7. Interjection.  Expression of wonder, amazement, or awe.
8. Interjection.  Expression of understanding, recognition, or realization.
9. Interjection.  A word to precede an offhand or annoyed remark.
10. Interjection.  A word to precede an added or comment or afterthought.
11. Interjection.  An invocation or address (similar to the vocative in languages with noun declension).
12. Interjection.  Exclamation for drama or emphasis (often poetic).
13. Interjection.  Expression of pain. See ouch.
14. Interjection.  Space filler or extra syllable, especially in (popular) music.
15. Interjection.  Used with a term of endearment.
16. Interjection.  (interrogative) Expression of mild scepticism.
17. Noun.  the letter O, o (more commonly spelled o).
18. Noun.  the digit 0 (especially in representations of speech).
19. Noun.  An utterance of oh; a spoken expression of surprise, acknowledgement, etc.
20. Verb.  (intransitive) To utter the interjection oh; to express surprise, etc.