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thymus gland

[ (theye-muhs) ]
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A gland located behind the breastbone that functions in the development of the immune system. The thymus is large in infancy and early childhood but begins to atrophy between ages eight and ten.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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