Sindarin name of a peak in the Misty Mountains translated “Redhorn”, itself a translation of Kh. Barazinbar of the same meaning (LotR/283). This name is a combination of caran “red” and rass “horn”, with the dh appearing because [[s|[nr] became [ðr]]] in the phonological history of Sindarin (LotR/1113, PE17/36).
Conceptual Development: In Lord of the Rings drafts from the 1940s, Tolkien first considered and rejected the names N. Bliscarn and N. Carnbeleg before settling on N. Taragaer “Ruddyhorn” (RS/419, 433), with Taragaer also appearing in The Etymologies (Ety/TARÁK). In these early drafts, Tolkien also considered the names N. Caradras and Rhascaron (RS/433), and he eventually switched to Caradras >> Caradhras (TI/166), keeping the final name thereafter.
The archaic form of Caradhras; see that entry for further discussion.