"diametric" in the adjective sense
1. diametral, diametric, diametrical
related to or along a diameter
"the diametral plane"
2. diametric, diametrical, opposite, polar
characterized by opposite extremes completely opposed
"in diametric contradiction to his claims"
"diametrical (or opposite) points of view"
"opposite meanings"
"extreme and indefensible polar positions"
Source: WordNet® (An amazing lexical database of English)
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