os-

prefix. about, around

os-

prefix. about

Derivations

• ᴹ√OS “round, about” ✧ Ety/OS

Element in

• N. Dagor-os-Giliath “Battle under Stars”
• ᴺS. osgaef “surroundings, environs, milieu”
• N. osgar- “to cut round, amputate” ✧ Ety/OS

Phonetic Developments

Development	Stages	Sources
ᴹ√OS > os-	[os-]	✧ Ety/OS

o

preposition. about, concerning

The Etymologies state that h- is prefixed to the word following this preposition, when it begins with a vowel: o Hedhil "concerning the Elves". Some scholars consider that this rule is not valid in Sindarin, but that the preposition would perhaps become oh in such a case (hence oh Edhil, to be compared with ah in Athrabeth Finrod ah Andreth)