Trist, a. pensive, sorrowful, sad
Tristâd, a. a becoming sad
Tristâu, v. to grow sorrowful
Tristlawn, a. sorrowful, rueful
Tristwch, Tristyd, n. sadness, sorrow
Trithro, a. of three turns
Trithroed, a. three-footed
Triugain, a. sixty
Triugeinfed, a. sixtieth
Tro, n. a turn; a time; a lax