or tylpt, f. [tólf], a number of twelve, a ‘duo-decade,’ dozen, a body of twelve, Eg. 341, Nj. 150, Fms. viii. 140, Hkr. ii. 398; fernar tylftir, þrennar tylftir, of the courts, Nj. 150, 244, Grág. i. 4, 72 (twelve being a holy number): of the sea, tylft, twelve miles, Landn. 25, Rb. 482, Bs. ii. 5. tylftar-eiðr, -kviðr, -kvöð (see eiðr, kviðr, kvöð), Gþl. 121, 547, Js. 30, K. Þ. K. 168, Landn. 89.