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organ

noun

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.