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

• unproductive
• unproductively
• unproductiveness
• unprofessional
• unprofessionally
• unprofitability
• unprofitable
• unprofitableness
• unprofitably
• UNPROFOR
• unprogressive
• unpromised
• unpromising
• unprompted
• unpronounceable
• unproper
• unprophetic
• unpropitious
• unpropitiously
• unpropitiousness
• unprotected
• unprotectedness
• unprotective
• unprotesting
• unprotestingly