What is the meaning of "ero" in Japanese?

This word appeared late in Japan. It seemed エロスcould only be read in academic writings. People have invented a hybrid adjective Eroi (エロい), denoting erotic. Ir became popular among civil.

Ero is short form of Eros (エロス).

Thus エロ can be noun and adjective.

So I’m getting piano lessons and my teacher wants me to get an upright piano instead of a keyboard. An upright piano is way above my price range, so what do I do? And what’s the difference between an upright piano and a keyboard?

What is the meaning of "ero" in Japanese?

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