frictional
Concise Oxford English Dictionary © 2008 Oxford University Press:
friction/ˈfrɪkʃn/
▶noun
- 1 the resistance that one surface or object encounters when moving over another.
■ the action of one surface or object rubbing against another.
- 2 conflict or disagreement.
– derivatives
frictional adjective,
frictionless adjective.
frictional adjective,
frictionless adjective.
– origin C16: via Fr. from L. frictio(n-), from fricare ‘to rub’.
'frictional' also found in these Oxford entries:

