1. (biology) an effect where a toxic substance acts like a stimulant in small doses, but it is an inhibitor in large doses.

Encyclopedia: Hormesis

• yarmulka
• yarmulke
• yarn
• yarn-dye
• yarn-spinning
• yarrow
• yashmac
• yashmak
• Yasser Arafat
• Yastrzemski
• yataghan
• yatobyo
• yaup
• yaupon
• yaupon holly
• yautia
• Yavapai
• yaw
• yawl
• yawn
• yawner
• yawning
• yawp
• yaws
• yay