pramnion
Could not find pramnio in Logeion dictionaries.
pramnio Noun: neuter dative singular, Noun: neuter ablative singular of pramnion
pramnĭon, ĭi, n.,
- a precious stone, the darkest kind of rock crystal, Plin. 37, 10, 63, § 173 (al. promnium).
pramnĭŏn, ĭī, n. , v. promnion : *Plin. 37, 173.