DIAMETRICAL
diametric, diametrical, opposite, polar
(adjective) 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”
diametral, diametric, diametrical
(adjective) related to or along a diameter; “the diametral plane”
Source: WordNet® 3.1
Adjective
diametrical (comparative more diametrical, superlative most diametrical)
Of or pertaining to a diagonal or diameter
Completely opposed
Synonyms
• (pertaining to a diagonal or diameter): diametral
• (completely opposed): antipodal
Source: Wiktionary
Di*am"e*tric, Di*am"e*tric*al, a.
1. Of or pertaining to a diameter.
2. As remote as possible, as if at the opposite end of a diameter;
directly adverse.
Source: Webster’s Unabridged Dictionary 1913 Edition