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: 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”).
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”).