systole /sisˈto-lē or -tə-lē/

1. Rhythmical contraction, esp of the heart, opp to diastole (physiology)
2. Collapse of the nucleus in mitosis
3. The shortening of a long syllable (grammar)

systolic /-tolˈik/ adjective

• blackhead
• blackheaded
• blackheads
• blackheart
• black-hearted
• blackhearts
• black hole
• black holes
• black horehound
• black house
• black houses
• black ice
• blacking
• blackings
• black in the face
• blackish
• blackjack
• blackjacked
• blackjacking
• blackjacks
• black knight
• black knights
• blacklead
• blackleads
• blackleg