laevorotatory or levorotatory /lē-vō-rōˈtə-tə-ri or -rō-tāˈ/

1. Counter-clockwise
2. Rotating the plane of polarization of light to the left (optics)

laevorotāˈtion noun

• on her beam-ends
• on high
• on hire
• on hold
• on ice
• onion
• onion dome
• onion domes
• onioned
• onion-eyed
• onion flies
• onion fly
• onionier
• onioniest
• onioning
• onions
• onion-skin
• onion-skins
• oniony
• oniric
• oniscoid
• Oniscus
• on-job
• on-job training
• onkus