photoresist
noun
pho·to·re·sist
ˈfō-tō-ri-ˌzist
ˌfō-tō-ri-ˈzist
: a photosensitive resin that loses its resistance to chemical etching when exposed to radiation and is used especially in the transference of a circuit pattern to a semiconductor chip during the production of an integrated circuit
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Merriam-Webster unabridged
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