An Etymological Dictionary of Astronomy and Astrophysics

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See also: From Du. koekje “little cake,” diminutive of koek “cake,” from M.Du. koke, akin to cake, M.E., from O.N. kaka (O.H.G. kuocho “cake”), any relation with Pers. kâk “biscuit; dry bread”? (loaned in Ar. ka’k).