/therrd"hand"/ , adj.
1. previously used or owned by two successive people.
2. (loosely) secondhand, esp. in poor condition.
3. obtained through two intermediates successively; twice removed from the original source.
adv.
4. after two other users or owners: He bought the guitar thirdhand.
5. by way of several intermediate sources; indirectly.
[ 1545-55; THIRD + HAND ]