A noun in The Etymologies of the 1930s glossed “sworn brother, associate”, a combination of ᴹQ. toron “brother” with the prefix o- “together” (Ety/TOR, WŌ).
Qenya
o-
prefix. together
oselle
noun. [sworn] sister, associate [f.]
otorno
noun. sworn brother, associate [m.]
ye-
verb. to be
-a
suffix. adjectival suffix
-va
suffix. adjectival
ná-
verb. to be
wa-
prefix. together
A noun in The Etymologies of the 1930s glossed “sister, associate”, a combination of ᴹQ. seler “sister” with the prefix o- “together” (Ety/THEL, WŌ), presumably meaning “✱sworn sister” like its male equivalent ᴹQ. otorno “sworn brother”.