ainas noun "a hallow, a fane", perhaps with stem ainass- (PE17:149). Compare yána #2.
hallow, a fane
noun. hallow, fane, hallow, fane, *shrine, holy place, sanctuary
- √AYA(N) “blessed; treat with awe/reverence, blessed; treat with awe/reverence; [ᴱ√] honour, revere” ✧ PE17/149
Development Stages Sources √AYA-N > ainas [ajnas] > [ainas] ✧ PE17/149
to hallow, bless, treat as holy
aina- (1) vb. "to hallow, bless, treat as holy" (PE17:149)
holy place, fane, sanctuary
yána (2) noun "holy place, fane, sanctuary" (YAN). Compare ainas in a post-LotR source.
#airita- vb. "hallow" (only pa.t. airitánë is attested) (VT32:7)