1
Stage 1 of 4
dia
Greek · ancient
"through, across"
through, across, combined with metron (measure)
2
Stage 2 of 4
diametrus
Latin · ancient
"the line measuring across a circle"
carried into Latin for the line measuring across a circle
3
Stage 3 of 4
diametre
Old French · medieval
"the measurement across a circle"
carried into French for the same measurement
4
Stage 4 of 4
diameter
English · 1300s
"the straight line measurement across a circle"
settled as the English word for the measurement across a circle
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