[oh] interj [ME o] (13c) 1--used to express an emotion (as surprise or desire) or in response to physical stimuli 2--used in direct address "~, waiter] Will you come here, please?" 3--used to express acknowledgment or understanding of a statement 4--used to introduce an example or approximation
[2]oh n [o; fr. the similarity of the symbol for zero (0) to the letter O] (1936): zero