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

• help
• helpable
• helpdesk
• helpdesks
• helped
• helper
• helpers
• helper T cell
• helper T cells
• helper T lymphocyte
• helper T lymphocytes
• helpful
• helpfully
• helpfulness
• helpfulnesses
• helping
• helping hand
• helping hands
• helpings
• helpless
• helplessly
• helplessness
• helplessnesses
• helpline
• helplines