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| the expanding and contracting opening in the iris of the eye, through which light passes to the retina |
| ductless glands above the kidneys, consisting of a cortex producing steroidal hormones, and a medulla producing epinephrine and norepinephrine |
appendage ap·pend·age (ə-pěn'dĭj)
n.
A part or organ attached to a main structure and subordinate in function or size.