ducally

[doo-kuh-lee, dyoo-]
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adverb

in the manner of or pertaining to a duke.
Heraldry. with a ducal coronet: a lion gules ducally gorged.

Origin of ducally

First recorded in 1815–25; ducal + -ly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ducally

Historical Examples of ducally