Definition of weakener in US English:

weakener

noun

  • See weaken

    • ‘As you might expect, increasing the number of interior walls in the signal's line of sight, ie fixed signal weakeners, made interference more likely, though again, a decent picture was usually possible, sometimes by making minor adjustments to the precise location of the receiver.’
    • ‘Says Coleridge, one of the foremost of English thinkers: ‘I believe the habit of perusing periodical works may be properly added to the catalogue of anti-mnemonics, or weakeners of the memory.’’
    • ‘Botulism toxins are muscle weakeners, not fillers.’
    • ‘These are notorious weakeners of the immune system.’