groinn.[F. groin, fr. grogner to grunt, L. grunnire.] The snout of a swine.(Chaucer.)v. i.[F. grogner to grunt, grumble.] To grunt to growl; to snarl; to murmur.(Chaucer.)Bears that groined coatinually. (Spenser.)n.[Icel. grein distinction, division, branch; akin to Sw. gren, branch, space between the legs, Icel. greina to distinguish, divide, Sw. grena to branch, straddle. Cf. Grain a branch.]1. (Anat.) The line between the lower part of the abdomen and the thigh, or the region of this line; the inguen.()2. (Arch.) The projecting solid angle formed by the meeting of two vaults, growing more obtuse as it approaches the summit.()3. (Math.) The surface formed by two such vaults.()4. A frame of woodwork across a beach to accumulate and retain shingle.(Weale.)v. t. (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.)