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Z line
Z line (plural Z lines)


noun 
Definition:
 
narrow line crossing muscle fibers: a narrow dark line across striated muscle fibers that marks the boundaries between adjacent segments
[< abbreviation of German Zwischenscheibe "intervening disk"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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