noun Biochemistry.
a rodlike structural protein of the red blood cell membrane.

1968; spect(e)r (cf. ghost def. 12) + -in2

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World English Dictionary
spectrin (ˈspɛktrɪn)
any one of a class of fibrous proteins found in the membranes of red blood cells, the brain, the intestine, etc
[C20: from spectr(e) + -in, referring to the ghosts (isolated cell membranes) of red blood cells, the source of the first known member of the class]

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American Heritage
Medical Dictionary

spectrin spec·trin (spěk'trĭn)
A contractile protein of high molecular weight that is a component of a network in the membrane of red blood cells, giving the cells flexibility.

The American Heritage® Stedman's Medical Dictionary
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