noun
Hammond organ
Refers specifically to the electric organ invented by Laurens Hammond, widely used in jazz, gospel, and rock music.
彼はジャズクラブでハモンドオルガンを演奏した。
He played the Hammond organ at the jazz club.
Variant with a middle dot; less common but still seen.
オルガン is a general term for any organ (pipe organ, electronic organ, etc.), while ハモンドオルガン specifies the Hammond brand and its distinctive tonewheel sound.
Borrowed from English 'Hammond organ', named after its inventor Laurens Hammond.