Llywio cerbyd a phenderfynu ei gwrs a'i leoliad drwy gyfrwng mapiau, siartiau a thechnoleg yw mordwyo.
Defnyddid y gair yn wreiddiol i ddisgrifio'r wyddor o lywio llong neu gwch, ond bellach gall gyfeirio at awyrennau a cherbydau'r gofod.
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