What's the "een" in Halloween?
archaic plural of cow, a double plural (cf. children) or genitive plural of Middle English kye "cows," from Old English cy (genitive cyna), plural of cu "cow."
(Heb. sing. parah, i.e., "fruitful"), mentioned in Pharaoh's dream (Gen. 41: 18). Here the word denotes "buffaloes," which fed on the reeds and sedge by the river's brink.