Etymology

Thursday

Thurs·day
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Today it means: The fifth day of the week in many religious traditions, and the fourth day of the week in systems using the ISO 8601 norm; it follows Wednesday and precedes Friday. Full definition →

Middle English Thursday ← Old English þursdæġ ← Old Norse þórsdagr
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The story

  1. Proto-West Germanic · derived from*Þunras dag“day of the thunder god”
  2. Old Norse · derived fromþórsdagr
  3. Old English · inherited fromþursdæġ
  4. Middle English · inherited fromThursday
  5. English todayThursday

From Middle English Thursday, Thuresday, from Old English þursdæġ, þuresdæġ (“Thursday”), possibly from a contraction of þunresdæġ (“Thursday”, literally “Thor's day”), equivalent to Thor + -s- + day, or of North Germanic origin, from Old Norse þórsdagr; all from Proto-West Germanic *Þunras dag (“day of the thunder god”). Compare West Frisian tongersdei, German Low German Dunnersdag, Dutch donderdag, German Donnerstag, Danish torsdag. More at thunder, day. A calque of Latin diēs Iovis (diēs Jovis), via an association (interpretātiō germānica) of the god Thor with the Roman god of thunder Jove (Jupiter).

Etymology from Wiktionary, CC BY-SA 4.0.