In a diametral fashion.

Directly opposing. / Of or relating to a diameter; diametral.

Of, relating to, or measured across a diameter. / Contrary; diametrically opposed.

(obsolete) A diameter.

Separated by a diameter, on exactly the opposite side. / (especially in the phrase diametrically opposed) Absolutely (in opposition).

Of or pertaining to a diagonal or diameter / Completely opposed

(chiefly dated or nonstandard) Alternative form of diameter

plural of diametral

plural of diametre