DUCALLY

Etymology

Adverb

ducally (comparative more ducally, superlative most ducally)

In the manner of a duke; in a way that befits a duke.

Source: Wiktionary

Du"cal*ly, adv.

Definition: In the manner of a duke, or in a manner becoming the rank of a duke.

DUCAL

Du"cal, a. Etym: [F. ducal. See Duke.]

Definition: Of or pertaining to a duke. His ducal cap was to be exchanged for a kingly crown. Motley.

Source: Webster’s Unabridged Dictionary 1913 Edition