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 Latin glāns, glāndem, with change in declension, ultimately from Proto-Indo-European *gʷelh₂- (“acorn”). Compare French gland, Romanian ghindă.
köken: From Middle Persian blwt' (balūt, “oak, acorn”), attested in Husraw ī Kawādān ud rēdag-ē, from Aramaic בְּלוּטָא / ܒܠܘܛܐ (bəllūṭā, ballūṭā, “oak; acorn”), see Arabic بَلُّوط (ballūṭ) for more.
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.
köken: Inherited from Latin glāns, glāndem, probably through the now archaic, dialectal form ghinde or through an intermediate Vulgar Latin root *glanda with change in declension. Compare Aromanian gljindã, Italian ghianda. Ultimately from Proto-Indo-European *gʷelh₂- (“acorn”).
köken: From Old Danish akærn, from Old Norse akarn (“acorn”), from Proto-Germanic *akraną, cognate with English acorn, German Ecker (archaic), Dutch aker (archaic), Gothic 𐌰𐌺𐍂𐌰𐌽 (akran, “fruit”).