noun Biochemistry.
a protein constituting the basic substance of elastic tissue.

1870–75; elast(ic) + -in2

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World English Dictionary
elastin (ɪˈlæstɪn)
biochem a fibrous scleroprotein constituting the major part of elastic tissue, such as the walls of arteries
[C19: from elastic + -in]

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Dictionary.com's 21st Century Lexicon
Main Entry:  elastin2
Part of Speech:  n
Definition:  See silverskin
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American Heritage
Medical Dictionary

elastin e·las·tin (ĭ-lās'tĭn)
An elastic, fibrous mucoprotein, similar to collagen, and the major connective tissue protein of elastic fibers. Also called elasticin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The dermis includes collagen, elastin, and nerve endings.
The lungs also become less elastic due to various factors including the loss of a tissue protein called elastin.
Specifically, she's been looking for collagen, elastin and hemoglobin.
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