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male🇬🇧
femalePast Tense
assayed
Past Participle
assayed
Gerund
assaying
3rd Person
assays
Assayed is the past tense and past participle of 'assay', meaning to scientifically test or analyze a substance—like blood, ore, or a drug—to determine its composition, purity, or biological activity. Think of lab technicians in white coats measuring how much gold is in a rock or checking if a patient's blood contains a virus.
The laboratory assayed the soil samples for heavy metal contamination.
Researchers assayed tumor tissue to measure expression levels of the target protein.
Before minting coins, ancient civilizations would assayed silver bullion to verify its purity.
The clinical trial assayed participants' serum for neutralizing antibodies after vaccination.
Geologists assayed the core samples and discovered unexpectedly high concentrations of lithium.
assay
Comes from Old French 'essayer' (to test, try), ultimately from Latin 'exagium' (a weighing, from 'ex-' meaning 'out' + 'agere' meaning 'to drive, lead, weigh'). The root conveys the core idea of testing, evaluating, or quantifying a substance—especially in scientific, metallurgical, or medical contexts. Examples include assay (noun/verb), assayable, re-assay, bioassay, immunoassay.