definition of
diametrical

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

[2] #2 diametrical s. [diametric, 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