The rotundity of the sounding-board may warrant this conjecture.
"Account of a Tour in Normandy, Vol. II. (of 2)"
Dawson Turner
Wade was dark and grim, and Murray too, despite his rotundity.
"From the Housetops"
George Barr McCutcheon
It will harden up so that its rotundity of outline will be preserved.
"Natural and Artificial Duck Culture"
James Rankin