Terc, n. a jerk, jolt
Terciad, n. a jerking, a jolting
Tercu, v. to jerk, to jolt
Terch, n. a loop, noose
Terchu, v. to loop, to noose
Teredig, a. clarified, refined
Teredigaeth, n. clarification
Teredd, n. a clarified state
Terfyn, n. extremity, limit
Terfynedigaeth, n. determination