Ilk. Doriathrin grammar.
Doriathrin was the dialect of Ilkorin spoken by the Elves of Doriath (LR/175). In The Etymologies, Tolkien marked almost as many words as Doriathrin (Dor.) as he did Ilkorin (Ilk.). There are very few examples of words appearing in both dialects, however, and almost all of them have the same form. In fact, the only words with distinct Ilkorian and Doriathrin forms are the names Ilk. Argad/Argador (Ety/AR²) versus Dor. Argador (Ety/GAT(H)), and Ilk. Mablosgen (Ety/MAP) versus Dor. Mablost (Ety/KAB).
Despite the lack of evidence, the examples in The Etymologies do hint at several possible differences between the two dialects:
Like Falathrin, the Doriathrin dialect influenced the common language of the survivors of the wars of Beleriand spoken at the mouth of the Sirion river (LR/178).