diastasis

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.]

1. Separation of normally joined parts, such as the separation of certain abdominal muscles during pregnancy. Also called divarication.
2. The last stage of diastole in the heart, occurring just before contraction and during which little additional blood enters the ventricle.

1. dislocation or separation of two normally attached bones between which there is no true joint. Also, an abnormally large separation between associated bones, as between the ribs.
2. diastasis cordis, the rest period of the cardiac cycle, occurring just before systole.

The noun has one meaning:

Meaning #1: separation of an epiphysis from the long bone to which it is normally attached without fracture of the bone