What is the meaning of Harmonium?

A small keyboard instrument that consists of a series of reed pipes, which sound when one of the keys is pressed to open a valve that allows air to pass through.

Synonym of Hooke's atom.

harmonium (musical instrument)

harmonium (musical instrument)

harmonium (musical instrument)

accordion (a small, portable, keyed wind instrument)

harmonium (musical instrument)

harmonium (musical instrument)

harmonium (musical instrument)

harmonium (musical instrument)

Source: wiktionary.org