DictionaryRoot: dia-
Greek
dia-
through, across; apart
Forms
- dia-
- di- — Used before a vowel in some Greek compounds.
Origin
Greek dia, ‘through’; a connection with the Indo-European word for ‘two’ has been proposed but is uncertain.
Note
Passing through something can also divide it, linking traversal with separation.
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noun
diameter
dye-AM-ih-tur/daɪˈæmɪtər/
The straight-line distance across a circle or round object through its center.
Etymology
A diameter is a measure across a circle: the line passes through its center from one side to the other. The name also denotes the length of that line.