diametrical
1. [ adjective ] related to or along a diameter
Synonyms: diametric diametral
Examples:

"the diametral plane"

Related terms: diameter diameter diameter
2. [ adjective ] characterized by opposite extremes; completely opposed
Synonyms: opposite polar diametric
Examples:

"in diametric contradiction to his claims" "diametrical (or opposite) points of view" "opposite meanings" "extreme and indefensible polar positions"

Related terms: different
Similar spelling:   diametrically
  diametric
  diametral
  diameter