Fifth wheel dating
In the case of Tocharian the link with wheeled transport, or in fact any form of transport, is non-existent. missing the vowel, meaning that the r has to pretend to be a vowel) of the PIE root – (seen above) meaning something along the lines of “to turn”, by a process known as reduplication.The chance of reduplicating a root then turning it into a noun is reasonably high and may have been done many times in history.However, if it had been done by one of the descendants of IE it should have produced a distinctly different form, recognisable to an IE linguist.Reduplication in IE is where a verb, noun or adjective is expanded, often to give emphasis.
This might have produced a shape like *, meaning something like “revolver”, hence “wheel”.
Although there is some discussion, the next language branch generally thought to have split from the main IE group is the Tocharian branch.
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