adminicle

n. [ L. adminculum support, orig., that on which the hand rests; ad + manus hand + dim. ending -culym. ] 1. Help or support; an auxiliary. Grote. [ 1913 Webster ]

2. (Law) Corroborative or explanatory proof. [ 1913 Webster ]

In Scots law, any writing tending to establish the existence or terms of a lost deed. Bell. [ 1913 Webster ]