I. noun
Etymology: Middle English seconde honde, from seconde, second, secound, adjective, second + honde, hand hand
1. : an intermediate person or means : intermediary — usually used in the phrase at second hand
even this historical fact I had only at second hand, from my aunt — Ben Riker
2. : an assistant foreman especially in textile industries
3. : an assistant hand : a manual laborer's helper
4. : the second player to have the right to bid or the second player to play to any trick in bridge
II. noun
Etymology: second (IV) + hand
: the hand marking seconds on a watch or clock — compare hour hand , minute hand