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Stage 1 of 3
thermos
Greek · ancient
"hot"
hot, combined with metron (measure) for an instrument measuring heat
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Stage 2 of 3
thermometre
French · 1624
"heat-measure"
formed from Greek thermos (hot) and metron (measure) for the new heat-measuring instrument
3
Stage 3 of 3
thermometer
English · 1630s
"an instrument for measuring temperature"
adopted from French for the instrument measuring temperature
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