headward

World English Dictionary
headward (ˈhɛdwəd)
 
adj
1.  (of river erosion) cutting backwards or upstream above the original source, which recedes
 
adv
2.  a variant of headwards

Collins
World English Dictionary
headwards or headward (ˈhɛdwədz)
 
adv
backwards beyond the original source: a river erodes headwards
 
headward or headward
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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