diametrical
Concise Oxford English Dictionary © 2008 Oxford University Press:
diametrical /ˌdʌɪəˈmɛtrɪk(ə)l/
▶adjective
- 1 (of opposites) complete; absolute: he's the diametrical opposite of Gabriel.
- 2 of or along a diameter.
– derivatives
diametric adjective,
diametrically adverb.
diametric adjective,
diametrically adverb.
'diametrical' also found in these Oxford entries:

