From Middle English rydyng; equivalent to ride + -ing.
From trithing (initial /t/ absorbed into preceding north, south, east, west, inner ‘th’ already sometimes /d/ in Middle English), from Middle English trithing, tridinge, from Old English *þriðing, from Old Norse þriðjungr ("third part"), from Proto-Germanic *þridjô ("third") (English third). Equivalent to [[third#English + third]]; compare with farthing. Cognate with English trithing.
The folk etymology that connects the term to the area a horse-rider could cover in a single day is incorrect, but may have influenced the spelling and pronunciation.
Modern English dictionary
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