Ilk. adhum n. “bridge”
A Doriathrin word for “bridge” appearing the Addenda and Corrigenda to The Etymologies (EtyAC/YAT), likely a derivative of the same primitive form ᴹ✶yatmā as its cognates in other languages. An earlier deleted form iaðum may indicate Tolkien’s uncertainty over the development of initial [j] (= “y”) in Ilkorin; elsewhere the rule is that initial [j] vanished.
References ✧ EtyAC/YAT
|ᴹ✶yatmā > aðum||[jatmā] > [jatmē] > [jatme] > [jadme] > [adme] > [aðme] > [aðm] > [aðum]||✧ EtyAC/YAT|