What is the meaning of Magnes?

Obsolete form of magnet.

second-person singular present indicative/subjunctive of magner

magnet, lodestone

lodestone (a magnetic stone that is an ore of iron)

inflection of magne:

1. masculine oblique plural
2. masculine nominative singular
3. feminine oblique/nominative plural

masculine oblique plural

masculine nominative singular

feminine oblique/nominative plural

magnet (piece of material that attracts some metals by magnetism)

magnet (person or thing that attracts)

Source: wiktionary.org