köken: From Middle High German eichel, from Old High German eihhila, from Proto-West Germanic *aikilā. Equivalent to Eiche (“oak”) + -el, alternative to Proto-West Germanic *-ilā (“fruit of the tree”). The sense “glans penis” is a semantic loan from Latin glāns.
köken: From Middle Dutch ecle, ekele, from Old Dutch *ēkila, *eikila, from Proto-West Germanic *aikilā. Equivalent to eik (“oak”) + -el. For the derogatory sense, compare English dickhead.
köken: Inherited from Old Polish żołądź, from Proto-Slavic *žȅlǫdь, from Proto-Balto-Slavic *gel- /*gil-, from Proto-Indo-European *gʷelh₂-. Noun 2 sense 1 is a semantic loan from Latin glāns.