Plural of gadgetry; multiple collections or examples of gadgets or the practice of using gadgets.
From gadget plus -ry (a suffix forming nouns indicating a collection, practice, or place), with plural -ies. The abstract noun describes the realm of gadgets collectively.
Notice how -ry creates abstract nouns that capture a whole culture or practice: gadgetry, trickery, thievery—it's a suffix that suggests a world of activity rather than just one thing, which is why 'gadgetries' feels redundant but linguistically interesting.
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