di·as·ta·sis (d - s t -s s)n. pl. di·as·ta·ses (-s  z ) 1. Pathology Separation of normally joined parts, such as the separation of adjacent bones without fracture or of certain abdominal muscles during pregnancy. 2. Physiology The last stage of diastole in the heart, occurring just before contraction and during which little additional blood enters the ventricle. [Greek, separation, from diistanai, to separate : dia-, apart; see dia- + histanai, to cause to stand; see st  - in Indo-European roots.]di a·static (d-sttk) adj. |
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