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"poikilothermic" animals.— Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
Also, from work recently done by J.O. Wakelin Barratt, it has been shown that under certain pathological conditions a warm-blooded (homoiothermic) animal may become for a time cold-blooded (poikilothermic).— Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1

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