systole
B2CEFR level
55/100Rarity: uncommon
TechnicalRegister
The phase of the cardiac cycle in which the ventricles contract and eject blood.
The murmur occupied the whole of systole, obscuring the first heart sound.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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