Trigonometry.
A trigonometric point; a trig point.
A stone, block of wood, or anything else, placed under a wheel or barrel to prevent motion; a scotch; a skid.
The mark for players at skittles, etc.
A dandy; coxcomb.
Triglyceride.
To stop (a wheel, barrel, etc.) by placing something under it; to scotch; to skid.
To fill; to stuff; to cram.
Neat; tidy; trim; spruce; smart.
Safe; secure.
Tight; firm; steady; sound; in good condition or health.
True; trusty; trustworthy; faithful.
Active; clever.
The branch of mathematics that deals with the relationships between the sides and angles of (in particular) right-angled triangles, as represented by the trigonometric functions, and with calculations based on said relationships.