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male🇬🇧
femalePlural
assays
Past Tense
assayed
Past Participle
assayed
Gerund
assaying
3rd Person
assays
Assay is both a noun and verb meaning to carefully analyze or test a substance—especially in science, medicine, or mining—to determine its composition, purity, or biological activity. Think of it as 'scientific detective work': a lab technician might assay a blood sample for vitamin D levels, or a geologist might assay ore to find out how much gold it contains.
The lab will assay the water sample for heavy metals tomorrow.
Scientists assayed hundreds of compounds to identify potential cancer drugs.
This enzyme assay measures how quickly the reaction occurs under different temperatures.
Her thesis involved developing a new cell-based assay for Alzheimer's biomarkers.
The assay results confirmed that the alloy contained 92.5% silver.
assay
Comes from Old French 'essai' (noun) and 'essayer' (verb), ultimately from Vulgar Latin *exagium, a variant of Latin 'exigere' meaning 'to weigh out, demand, test, or examine'. The root 'exig-' combines 'ex-' (out) + 'agere' (to drive, lead, do). It conveys the core idea of testing, evaluating, or determining composition/quality through measurement or analysis. Examples include assay, exiguous, exigent, agitate, act, transaction.