Su-per-in-tend-ent, arolygwr, goruchwyliwr
Su-per-nat-u-ral, goruchnaturiol
Tac-i-turn-i-ty, dystawrwydd
Ter-ri-to-ri-al, tiriogaethol
Tes-ta-ment-a-ry, cymmynawl
Tes-ti-mo-ni-al, tystlythyr; tystiolaethol
Trans-fig-u-ra-tion, trawsddulliad, gweddnewidiad
Tran-sub-stan-ti-ate, trawssylweddu
Trig-o-nom-e-try, trionglaeth
Un-ac-count-a-ble, annirnadwy, dieithr