Webster's English Dictionary

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cortex

cor.tex \'ko.r-.teks\ \'ko.rt-*-.se-z\ n or cor.ti.ces or cor.tex.es [L 
   cortic-, cortex bark] pl  1: a plant bark or rind used medicinally  2: the 
   outer or superficial part of an organ or body structure; esp :: the outer 
   layer of gray matter of the cerebrum and cerebellum 3a: the typically 
   parenchymatous layer of tissue external to the vascular t issue and 
   internal to the corky or epidermal tissues of a green plant; broadly : all 
   tissues external to the xylem 3b: an outer or investing layer of various 
   algae, lichens, or fungi