kidney: either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine
excretory organ: an organ that separates waste substances from the blood and discharges them
pleurothallis: any of numerous small tufted orchids of the genus Pleurothallis having leathery to fleshy leaves and racemes of 1 to many small flowers