Cynghrair, n. treaty
Cynghreirio, to enter into treaty
Cynghreiriol, a. confederate
Cynghreiriwr, n. a sworn confederate
Cynghroes, a. intersecant
Cynghroesi, v. to intersect
Cynghrhon, a. spheric
Cynghrwm, a. of convex form
Cynghryn, mutually trembling
Cyngwerth, n. equivalence