Etymology
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pileated (adj.)

"having the feathers of the top of the head elongated and conspicuous," 1728, from Latin pileatus "capped," from pileus "conical felt cap without a brim," which is perhaps from Greek pilos "felt; felt hat," also "felt shoe, felt blanket," or they may be from a common source (somewhat similar words are found in Germanic and Slavic). Beekes calls it "an old culture word of unknown origin." Applied in natural history to sea urchins and certain birds, notably the pileated woodpecker, a large species of North America.

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