Thursday is a noun and defined as the fifth day of the week. First used before the 12th century, Thursday is one of the many words in the English language that has its roots in Norse mythology.
Interestingly, the days of the week in the English language derived from Norse mythology, unlike the Romance languages days of the week, which derive from Roman mythology. This divergence is often referred to as interpretatio germanica and describes how the Germanic peoples identified and adapted Roman gods with the names of Germanic deities. According to historians, this transition occurred when both cultures came into contact around the 1st century AD.
For example, Thursday can be broken down into “Thors” + “day”, which derives from the Norse god of thunder Thor. Thor is equivalent to the Roman god of thunder Jupiter, and in the Romance languages such as Italian and Spanish the fifth day of the week is giovedi and jueves, respectively.
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Viking Ship Museum in Roskilde
“Thursday.” Merriam-Webster.com Dictionary