The word for today is…
metathesis (noun) -
: a change of place or condition: such as
a: transposition of two phonemes in a word (as in the development of crud from curd or the pronunciation \ˈpər-tē\ for pretty)
b: a chemical reaction in which different kinds of molecules exchange parts to form other kinds of molecules
Source : Merriam-Webster
Etymology : One familiar example of metathesis is the English word thrill, which was thyrlian in Old English and thirlen in Middle English. By the late 16th century, native English speakers had switched the placement of the r to form thrill. Another example is the alteration of curd into crud (the earliest sense of which was, unsurprisingly, curd). It probably won't surprise you to learn that the origin of metathesis lies in the idea of transposition—the word was borrowed into English in the mid-16th century and derives via Late Latin from the Greek verb metatithenai, meaning "to transpose."
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