The Collaborative International Dictionary
Groining
Groin \Groin\, v. t. [imp. & p. p. Groined; p. pr. & vb. n. Groining.] (Arch.) To fashion into groins; to build with groins.
The hand that rounded Peter's dome,
And groined the aisles of Christian Rome,
Wrought in a sad sincerity.
--Emerson.
Wiktionary
groining
vb. (present participle of groin English)