In a manner involving or relating to two axes; with respect to biaxial properties or characteristics.
From 'biaxial' plus the adverbial suffix '-ly'. This adverb modifies verbs and adjectives to indicate biaxial manner or orientation.
When scientists write 'the crystal biaxially refracts light,' they're using this adverb to describe a very specific optical behavior that tells them exactly what mineral they've found!
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