LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Nymphaeus

Nymphaeus m sg (genitive Nymphaeī)
Classical[nymˈpʰae̯.ʊs]Ecclesiastical[nimˈfɛː.us]

Meaning

  1. masculinesingularAn affluent of the Tigris and boundary between the Romans and Persian empire, now the Batman River
  2. masculinesingularA small river of Latium mentioned only by Pliny

Declension

declension
formsingularplural
nominativeNymphaeus—
genitiveNymphaeī—
dativeNymphaeō—
accusativeNymphaeum—
ablativeNymphaeō—
vocativeNymphaee—

Nymphaeus, i, m.
I. A river in Latium, between Circeii and Astura, now Ninfa, Plin. 3, 5, 9, § 57.—
II. A river in Mesopotamia, Amm. 18, 9, 2.

Origins

Borrowed from Ancient Greek Νύμφιος (Númphios).

In the Academy Smith's classical dictionaries

GeographyNymphaeusNymphaeus (Ninfa), a small river of Latium, mentioned only by Pliny (3.5. s. 9), who describes it as flowing into the sea between Astura and Circeii. …GeographyNymphaeusNymphaeus (Amm. Marc. 18.9.3; Νύμφιος, Procop. B. P. 1.8, 21; Suidas, s. v.), an affluent of the Tigris, 240 stadia from Amida, and the boundary betwe…

Quick answers

What does Nymphaeus mean in Latin?
Nymphaeus, a proper noun, means “An affluent of the Tigris and boundary between the Romans and Persian empire, now the Batman River; A small river of Latium mentioned only by Pliny”.
What is the genitive of Nymphaeus?
The genitive singular is Nymphaeī. Nymphaeus is masculine, second declension.
How do you pronounce Nymphaeus?
In classical Latin, [nymˈpʰae̯.ʊs]; in ecclesiastical (church) Latin, [nimˈfɛː.us].