/oh/ , interj., n., pl. oh's, ohs , v.
interj.
1. (used as an expression of surprise, pain, disapprobation, etc.)
2. (used in direct address to attract the attention of the person spoken to): Oh, John, will you take these books?
n.
3. the exclamation "oh."
v.i.
4. to utter or exclaim "oh."
[ later sp. of O, from mid-16th century ]