smyrus
Could not find zmyrum in Logeion dictionaries.
zmyrum Noun: masculine genitive plural, Noun: masculine accusative singular of smyrus
smyrus or zmyr-, i, m., = σμῦρος,
- a kind of fish, otherwise unknown, Plin. 32, 11, 53, § 151.
smȳrus, ī, m., s. zmȳrus.
smȳrus (zmy-), ī, m. , le mâle de la lamproie [poisson] : Plin. 32, 151.