n.that which weakens or causes a loss of strength

"doubt is a great weakener of resolve"

Weakener of White (Wow), a Gene That Modifies the Expression of the White Eye Color Locus and That Suppresses Position Effect Varieg...
Birchler, JA, Bhadra, U, Rainbow, L, Lins, R, Nguyen-Huynh, T. Weakener of white (Wow), a gene that modifies the expression of the w...
Light beam weakener
MIT Seeks Hurricane Weakener Could Sheen on Ocean Sap Storm Strength?
Discussion on Sociological Significance of Social Weakener
Boost Converter with Harvest Regulator Provides High-Efficiency Power Compression for Bio-Hybrid Fuel Cells and Other Weak Energy So...
Induction motor flux and torque control
The Use of Step Weakeners in Photographic Photometry
ABSORPTION STEP-WEAKENERS OF ANTIMONY
Enhancement of quasiparticle recombination in Ta and Al superconductors by implantation of magnetic and nonmagnetic atoms