organ

n.

1. An instrument

   medium, means, way; see device 1, tool 1.

2. A part of an organism having a specialized use

   vital part, vital structure, functional division, process; see gland.

   Human organs include: brain, heart, eye, ear, nose, tongue, lung, kidney, stomach, intestine, spleen, pancreas, gallbladder, liver, testis, uterus, ovary, fallopian tube, bladder, penis.

3. A musical instrument

   wind instrument, keyboard instrument, harmonium, melodeon, calliope, hurdy-gurdy, accordion; see also musical instrument.

   Types of organs include: great, swell, choir, orchestral, solo, pipe, echo, pedal, altar, chancel, antiphonal, gallery, floating, barrel, reed, electric, electronic, hand, grind, street.

4. A periodical

   journal, newsletter, newspaper, publication, rag*; see also journal 2.