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cortex

noun

cor·​tex ˈkȯr-ˌteks How to pronounce cortex (audio)
plural cortices ˈkȯr-tə-ˌsēz How to pronounce cortex (audio) also cortexes
1
a(1)
: the outer or superficial part of an organ or bodily structure (such as the kidney, adrenal gland, or cerebellum or a bone)
especially : cerebral cortex
(2)
: the proteinaceous usually pigmented layer of a hair below the cuticle
b
: the outer part of some organisms (such as paramecia)
2
: a plant bark or rind (such as cinchona) used medicinally
3
a
: the typically parenchymatous layer of tissue external to the vascular tissue and internal to the corky or epidermal tissues of a green plant
broadly : all tissues external to the xylem
b
: an outer or investing layer of various algae, lichens, or fungi

Example Sentences

Recent Examples on the Web All of this is well understood, but some GnRH neurons also connect to the cortex and hippocampus, brain regions associated with learning and memory. Simon Makin, Scientific American, 1 Sep. 2022 One of these Nature papers demonstrates that the mouse has three excitatory, glutamatergic cells in the upper layers of its cortex while humans have five. Christof Koch, Scientific American, 6 Oct. 2021 To initiate a movement, impulses from the motor cortex instruct the spinal cord neurons to produce muscular contraction. György Buzsáki, Scientific American, 14 May 2022 Researchers implanted tiny sensors into the motor cortex of the brain of a patient who moved a robotic arm using only her thoughts. Margaret Osborne, Smithsonian Magazine, 2 May 2022 How does that not activate a kind of delight at the back of the cortex? Naaman Zhou, The New Yorker, 19 Apr. 2022 Computer technology and the rise of the developing world would amplify and accelerate all these trends, turning the United States into a sort of frontal cortex for the globalizing economy. New York Times, 7 Apr. 2022 In a hijack situation, the thalamus controls the air traffic differently and bypasses the cortex, sending the signal straight to the amygdala. Adaora Ayoade, Forbes, 28 June 2022 While certain perfectly sized and shaped hydrators and proteins can seep past the hair’s outer cuticle layer, into the deeper cortex, says Wilson, their effect is short-lived. Jolene Edgar, Allure, 24 June 2022 See More

Word History

Etymology

Latin cortic-, cortex bark — more at cuirass

First Known Use

circa 1676, in the meaning defined at sense 1a(1)

Time Traveler
The first known use of cortex was circa 1676

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