Stratos, an army; strategy, strategic.
Strĕpho, I turn; catastrophe.
Technē, an art; technical.
Tĕlē, distant; telegraph, telescope, telephone, telegram.
Temno, I cut; anatomy, lithotomy.
Tetra, four; tetrachord, tetrarch.
Theāomai, I see, behold; theatre, theory.
Theos, a god; theist, enthusiast, theology.
Thermē, heat; thermal, thermometer, isotherm.
Tithēmi, I place; thēsis, a placing; synthesis, hypothesis.