deriv SD cv (989) ashtadhyayi.com hei.de L 989 ETT STT a 2.1.37 ALPH OLDHOMEPAGE NEWHOMEPAGE

paJcamI bhayena

पञ्चमी भयेन ONPANINI 21037

(Optionally,) a fifth (may form a /tatpuruSa) with bhayam भयम्.

vRkebhyo bhayam वृकेभ्यो भयम् "fear from wolves"
→ **vRkebhyas वृकेभ्यस् + bhayam भयम्, with vRka वृक ibc by upasarjan...
→ vRka- वृकॱ + bhayam भयम्, by supodhAtupr...
→ !**vRkabhayam वृकभयम् "lycophobia"

**vRkAt वृकात् + **bhayam भयम् → **vRkabhayam वृकभयम् "fear of the wolf"

The **vRkebhyas वृकेभ्यस् here has fifth by bhItrArthAnAmbh... and apAdAnep....

Why do we say "optionally"?

We may also say

vRkebhyo bhayam वृकेभ्यो भयम् "fear of wolves"

so this is not a /nityasamAsa.