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elas·ti·ca i-'las-tik-ə n either of two layers of elastic tissue present in the walls of most arteries:
a) an inner layer between the intima and media
b) an outer layer between the media and adventitia
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elas·ti·ca (e-lasґtĭ-kə) [L.] 1. elastic tissue. 2. either the internal or external elastic membrane.Medical dictionary. 2011.