achad (“camp”) + in (pl. genitive article) + sedryn (pl. of sadron “faithful one”)
Sindarin
echad
noun. camp
echad
noun. camp
Echad i Sedryn
noun. camp of the faithful
echad i sedryn
place name. Camp of the Faithful
cabed
noun. leap
A noun for “leap” appearing in names like Cabed Naeramarth “Leap of Dreadful Doom” and Cabed-en-Aras “Deer’s Leap” (S/224; UT/150), apparently the gerund of a verb cab- “leap, ✱jump” based on the root ᴹ√KAP of similar meaning.
Conceptual Development: This root dates all the way back to the Gnomish Lexicon of the 1910s, and there are similar nouns based on this root appear in Tolkien’s earlier writings: G. camp “leap” in the Gnomish Lexicon of the 1910s (GL/24) and ᴱN. cais “leap” in Early Noldorin Word-lists of the 1920s (PE13/140). The latter was based on primitive ᴱ✶kapse, with the diphthong ai the result of the vocalization of p to i.
cab
leap
(i gâb, i chebir), pa.t. camp;
cabed
leap
(i gabed, o chabed), pl. cebid (i chebid)
A noun for “camp” appearing as an element in the name Echad i Sedryn “Camp of the Faithful” (UT/153). It might be a combination of √ET “out” and √KHAD “sit”, though if it were it should be ✱✱echadh.