oreon
Could not find oreo in Logeion dictionaries.
oreo Noun: neuter dative singular, Noun: neuter ablative singular of oreon
ŏrēon or ŏrīon, i, n., = ὄρειον,
- a mountain-plant, a kind of polygonos, Plin. 27, 12, 91, § 115
1 ŏrēŏn, ī, n. , v. orion 2 : Plin. 27, 115.