#1 diametric a. [diametral, diametrical] related to or along a diameter; "the diametral plane". wn
#2 diametric s. [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". wn
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