In a right-handed manner or toward the right side.
From 'dextral' with the adverb-forming suffix '-ly', creating an adverbial form that describes actions or directions performed toward the right.
This rarely-used adverb demonstrates how English can stack multiple directional and manner indicators together—turn 'dextral' into 'dextrally' and you've converted a descriptor into an instruction for how to move.
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