diametric

/ˌdaɪəˈmɛtrɪk/
adjective
  1. Relating to or along a diameter.
    • The diametric line passes through the center of the circle.
    • The gear's diametric pitch determines its size.
    • In a diametric measurement, the distance is taken from one side to the opposite side.
  2. Completely opposite; directly contrary.
    • There is a diametric difference between the old and new policies.
    • Their views on education were diametric opposites.
    • The two candidates held diametric positions on tax reform.
Antonyms
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