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Children's Dictionary
bladder an organ inside the body that collects urine. The bladder gets larger when it fills and smaller when it becomes empty.
brain the organ inside the skull of humans and animals. The brain is the main part of the central nervous system. It controls the body's movements and activities and is the center of thought, memory, and feelings. [1/3 definitions]
donor one who contributes blood, tissue, or an organ for medical purposes. [1/2 definitions]
ear1 the organ of hearing in people and some other animals. [1/3 definitions]
eye the organ of the body that gives animals sight, and the area close around it. [1/5 definitions]
gill1 the organ used for breathing by fish and other animals that live in water.
gland a group of cells or an organ that produces fluids that are released into the body or pass out of the body.
harmonica a small wind instrument in the shape of a rectangle. It is held in the hands and played by blowing and inhaling air over a set of metal reeds; mouth organ.
heart the organ that pumps blood through the body of a person or animal. [1/6 definitions]
liver1 a large, reddish brown organ in the body that has many functions. The liver cleans the blood, stores energy and nutrients, makes bile, and helps the body digest fats. It is found at the top of the abdomen. [1/2 definitions]
ovary the organ in a female animal that produces eggs and certain hormones. [1/2 definitions]
penis the male sex organ through which sperm is transferred to a female. The penis is also used to dispose of urine.
spleen an organ near the stomach that stores blood. The spleen gets rid of old red blood cells, and makes certain kinds of white blood cells.
stomach the organ in the body that receives food that has been swallowed and begins to digest it. [1/3 definitions]
taste bud one of the bumps on the surface of the tongue that form the sense organ of taste. The taste buds sense whether something is sweet, sour, salty, or bitter.
tongue the movable organ in the bottom of the mouth, used for licking, tasting, swallowing, and human speech. [2/5 definitions]
transplant to remove a body organ by surgery and attach it somewhere else on the same body or on another body. [1/3 definitions]
udder a large organ with two or more glands, each with its own nipple. Udders are the organs in mammals such as cows and goats from which the offspring drink milk.
uterus the muscular organ of a female mammal in which the fetus develops before birth.