pergracilis
Could not find pergradior in Logeion dictionaries. Looking for closest alphabetic form.
per-grăcĭlis, e, adj.,
- very slender (post-Aug.): caulis, Plin. 25, 13, 101, § 159.
per-gracilis, e, sehr schlank, Plin. 25, 159.
pergrăcĭlis, e, très mince, très grêle : Plin. 25, 159.