Dudley Henriques wrote
Any roll performed by an airplane through 3 dimensional space is a
barrel roll by definition.

"Ah well...there you go again." Dudley.

Once again I am posting Wikipedia's (and mine) definition of a
"barrel roll". Now, would you be so kind as to post the source
of the definition that you use. BTW, William Kershner shares the
Wikipedia definition in his "The Flight Instructor's Manual.

Just point us at the definition.

Barrel roll
From Wikipedia, the free encyclopedia
In aviation, the maneuver includes a constant variation of attitude in all
three axes, and at the midpoint (top) of the roll, the aircraft is flying
inverted, with the nose pointing at a 90-degree angle ("sideways") to the
general path of flight. The term "barrel roll" is frequently used,
incorrectly, to refer to any roll by an airplane (see aileron roll), or to
a helical roll in which the nose remains pointed generally along the flight
path. In fact, the barrel roll is a *SPECIFIC* and difficult maneuver; a
combination of a roll and a loop. It is not used in aerobatic competition.

Bob Moore