assay
as-say
verb
To analyse or test a substance, often in a laboratory setting.
"Scientists will assay the new chemical compound."
noun
An analytical procedure or test, especially in biology or pharmacology.
"They developed a new assay for the enzyme."
verb
To determine the purity or composition of a metal or substance.
"We must assay the ore sample carefully."
noun
A test to determine the purity or composition of a substance.
"The gold assay confirmed its high purity."