Accessary (#; 277), a. Accompanying, as a subordinate; additional; accessory; esp., uniting in, or contributing to, a crime, but not as chief actor. See Accessory.
[1913 Webster]

To both their deaths thou shalt be accessary. Shak.
[1913 Webster]

Amongst many secondary and accessary causes that support monarchy, these are not of least reckoning. Milton.
[1913 Webster]