porkpen
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porcupine — c.1400, porke despyne, from O.Fr. porc espin (early 13c.), lit. spiny pig, from L. porcus hog + spina thorn, spine. The word had many forms in M.E. and early Mod.E., including portepyn, porkpen, porkenpick, porpoynt, and Shakespeare s porpentine… … Etymology dictionary