A root in The Etymologies of the 1930s glossed “gate, entrance” (Ety/AD) that seems to have replaced ᴱ√BOÐO (QL/75) from the Qenya Lexicon of the 1910s. Its two main derivatives are ᴹQ. ando and N. annon “(great) gate, door”. These words in turn were transferred in 1959 to the root √ANA “to, towards”, from the original “approach, entrance” (PE17/40). Thus it seems Tolkien abandoned this root, perhaps because he wished to use it instead for √AD(A) “alongside, by the side of”, one of the etymologies Tolkien considered for the Eldarin words for “and” (PE17/71).
root. entrance, gate