Neptuno
Neptuno is a Latin form of Neptunus, meaning “Neptune, god of the sea; the sea”. It is the ablative singular masculine noun or dative singular masculine noun.
Found 40 times in the Latin texts on Socratos.
Where it is used
Cicero, De Natura Deorum 2.66: … m a iuvando credo nominatam. Aqua restabat et terra, ut essent ex fabulis tria regna divisa. datum est igitur Neptuno alterum, Iovis ut volumus fratri, maritimum omne regnum, nomenque productum ut Portunus a porta sic Neptunus …
Cicero, De Haruspicum Responso In P. Clodium 20: … os populo Romano praemonstrare et praecinere fateatur? de ea re scriptum est: postiliones esse Iovi, Satvrno, Neptvno, Tellvri, dis caelestibvs.
Plautus, Rudens 4.2.906: Neptúno has agó gratiás meo patróno,
All forms of Neptunus (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.