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)

• fastening
• fastenings
• fasten on
• fastens
• Fastens
• Fastens-eve
• Fastens Tuesday
• faster
• Fastern's-e'en
• fasters
• fastest
• Fastext
• fast food
• fast foods
• fast forward
• fast-forward
• fast-forwarded
• fast-forwarding
• fast-forwards
• fast-handed
• fasti
• fastidious
• fastidiously
• fastidiousness
• fastidiousnesses