The name Rathlóriel means "Golden-bed". In the Etymologies, the name Rath Loriel is said to contain the Noldorin word rath ("coarse, river-bed") and lor- ("gold").
Noldorin
rath
noun. course, river-bed
rath
noun. course, riverbed
rath
noun. street (in a city)
rathcarn
place name. Red Way
rath a chelerdain
place name. Street of the Lampwrights
rath dínen
place name. Silent Street
rathloriel
place name. Golden-bed, Bed of Gold
Rathlóriel
Rathlóriel
ostrad
noun. street
A word appearing in The Etymologies of the 1930s as N. ostrad “street”, a combination of N. ost “city” and N. râd “path, track” (Ety/RAT).
Neo-Sindarin: Some Neo-Sindarin writers update this word to ᴺS. othrad “street” as suggested in HSD (HSD), based on words like othrond “stronghold” = ost + rond. I think either is fine if we assume othrad is an ancient compound and ostrad was a late (or reformed) compound; compare N. mistrad “error” which also shows medial str.
crandir
place name. Red Way
iôr
noun. course
iôr
noun. course
ostrad
noun. street
Variant of Crandir, an earlier name for Celebrant in Lord of the Rings drafts from the 1940s (RS/433). Its first element is likely rath “course” and its second element a variant of caran “red”, as suggested by Roman Rausch (EE/1.10).