Ai! Lá polin saca i quettar!
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Isolated from Lindórinan. The independent form of the word may differ; it is unclear where the i of the compound Lindórinan comes from. In the Etymologies, the Eldarin words for "land" are derived from a stem NDOR "dwell, stay, rest, abide" (LR:376).
No Nandorin word is there listed, but Sindarin dor is derived from primitive ndorê. Notice, however, that Tolkien many years later derived the Eldarin words for "land" from a stem DORO "dried up, hard, unyielding" (WJ:413). However, this later source does confirm that the Primitive Quendian form was ndorê, now thought to be formed by initial enrichment d > nd. This is defined as "the hard, dry land as opposed to water or bog", later developing the meaning "land in general as opposed to sea", and finally also "a land" as a particular region, "with more or less defined bounds".
Whether dóri- actually comes from ndorê is highly doubtful (this would rather yield *dora in Nandorin), but it must be derived from the same set of stems.