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plural glochids
A small, detachable, irritant spine occurring in dense clusters in the areoles of certain cacti such as the prickly pear. quotations examples
[The bunny-ears cactus is] a particularly unpleasant cactus with thousands of nearly invisible, glochid [...] spines.
2016, Justin O. Schmidt, The Sting of the Wild, Johns Hopkins University Press, page 29