Definitions of odd:

• adjective:   of the remaining member of a pair, of socks e.g.
• adjective:   not easily explained

  Example: "It is odd that his name is never mentioned"

• adjective:   not divisible by two
• adjective:   an indefinite quantity more than that specified

  Example: "Invited 30-odd guests"

• adjective:   beyond or deviating from the usual or expected

  Example: "Had an odd name"

• adjective:   not used up

  Example: "Some odd dollars left"