Source: See p 6 of 10 of the PDFs, first leftward para.
Beware that p 6 of the PDF is labelled as p 18 on the document itself.
The English name of starch, as well as its equivalent in German, Sta¨ rke, or in Swedish, Sta¨ rkelse, is not related, as in Greek, to its manufacturing process but to its utilization. As a matter of fact, those names are related to the same Indo- European root as the adjective stark, in English “rigid, stiff” and in German and Swedish “solid, resistant,” and this relation is due to the stiffness which is given to fabrics and clothes by the application of starch.
Footnote: I researched the etymology of `starch’ after discovering its derivation fromthe PIE root ster-1)).