DictionaryRoot: algein
Greek
algein
to feel pain
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noun
analgesia
an-ul-JEE-zhuh/ˌænəlˈdʒiːʒə/
Absence or relief of pain without loss of consciousness.
Etymology
“Without” and “to feel pain” identify the particular sensation that is absent. Although the Greek noun could mean insensibility more broadly, the medical meaning concerns loss of pain sensation while touch remains perceptible.