The Collaborative International Dictionary of English v.0.48:

Preremote \Pre`re*mote\, a.
   More remote in previous time or prior order.
   [1913 Webster]

         In some cases two more links of causation may be
         introduced; one of them may be termed the preremote
         cause, the other the postremote effect.  --E. Darwin.
   [1913 Webster]