a group of tissues that perform a specific function or group of functions
Examples of animal organs are heart, lungs, brain, eye, stomach, spleen, bones, pancreas, kidneys, liver, intestines, skin, urinary bladder and sex organs
Examples of plant organs are the roots, stems, leaves, flowers, seeds and fruits
Word origin: L. Organum, Gr.; akin to work, and E. Work: cf. F. Organe.